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I would think that no matter what, our discharges are going to
generate much more heat than a less than 1C discharge. I would
think the higher discharge rates would result in fewer cycles which
is just what we see compared to manufacturer specs.<br>
<br>
<div class="moz-cite-prefix">On 10/9/2015 4:32 PM, Robert L.
Beaubien via NSRCA-discussion wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">My
guess would be that is a function of the design of the
battery to keep high current degradation out of the equation
as long as you operate it within the specs. I’m betting
that as long as the battery temp stays reasonable, you
aren’t “damaging” the battery during discharge.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"
style="margin-left:.5in;text-indent:-.25in;mso-list:l0
level1 lfo1">
<!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"><span
style="mso-list:Ignore">-<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Robert
Beaubien<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:.5in;text-indent:-.25in;mso-list:l0
level1 lfo1">
<!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"><span
style="mso-list:Ignore">-<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Sr.
Software Architect<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:.5in;text-indent:-.25in;mso-list:l0
level1 lfo1">
<!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"><span
style="mso-list:Ignore">-<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Kool
Software LLC<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">“Dear
Algebra, Please stop asking us to find your X. She's
never coming back and don't ask Y.”<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
DaveL322 [<a class="moz-txt-link-freetext" href="mailto:DaveL322@comcast.net">mailto:DaveL322@comcast.net</a>]
<br>
<b>Sent:</b> Friday, October 9, 2015 12:01 PM<br>
<b>To:</b> Robert L. Beaubien <a class="moz-txt-link-rfc2396E" href="mailto:rob@koolsoft.com"><rob@koolsoft.com></a>;
General pattern discussion
<a class="moz-txt-link-rfc2396E" href="mailto:nsrca-discussion@lists.nsrca.org"><nsrca-discussion@lists.nsrca.org></a><br>
<b>Subject:</b> Re: [NSRCA-discussion] FW: 10s LiPo
Charger Recommendation<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Presumably the life cycle data is
generated from discharges similar to what a cell phone or
other consumer product would see? Maybe 1/10C, or 1/4?
Consumer products are rarely going to see more than 1C
peaks during discharge. It would be interesting to know
just how applicable the data is when the average discharge
rate is on the order of 6 or 8C, with peaks of 20C. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div id="composer_signature">
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#575757">Regards,<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#575757"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#575757">Dave<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#575757"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#575757">Please pardon any
spelling errors or brevity.....Sent on a Sprint Samsung
Galaxy Note® 3<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
<br>
-------- Original message --------<br>
From: "Robert L. Beaubien via NSRCA-discussion" <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org"><a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a></a>>
<br>
Date: 10/09/2015 13:08 (GMT-05:00) <br>
To: General pattern discussion <<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
<br>
Subject: Re: [NSRCA-discussion] FW: 10s LiPo Charger
Recommendation <o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Here
is an excellent article about prolonging life of lithium
based batteries. A typically battery has a 300-500 cycle
life charged to 4.2v/cell, dropping to 4.1v/cell
increases life to 600-1000 cycles.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a
moz-do-not-send="true"
href="http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries"><a class="moz-txt-link-freetext" href="http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries">http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries</a></a>
</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79">-</span><span
style="font-size:7.0pt;color:#1F4E79">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Robert
Beaubien</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79">-</span><span
style="font-size:7.0pt;color:#1F4E79">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Sr.
Software Architect</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79">-</span><span
style="font-size:7.0pt;color:#1F4E79">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Kool
Software LLC</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">“Dear
Algebra, Please stop asking us to find your X. She's
never coming back and don't ask Y.”</span><o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
NSRCA-discussion [<a moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>]
<b>On Behalf Of </b>James Hiller via NSRCA-discussion<br>
<b>Sent:</b> Friday, October 9, 2015 9:38 AM<br>
<b>To:</b> 'General pattern discussion' <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org"><a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a></a>><br>
<b>Subject:</b> Re: [NSRCA-discussion] FW: 10s LiPo
Charger Recommendation</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Using
only about 45% of capacity it didn't make sense to charge
to 4.2 so I set the charge cutoff to 4.15 last year which
charges to about 95%. I have no proof but the batteries
seam happier with the lower charge voltage.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Jim</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif">
NSRCA-discussion [<a moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>]
<b>On Behalf Of </b>Dave Lockhart via
NSRCA-discussion<br>
<b>Sent:</b> Friday, October 09, 2015 6:21 AM<br>
<b>To:</b> 'General pattern discussion'<br>
<b>Subject:</b> Re: [NSRCA-discussion] FW: 10s LiPo
Charger Recommendation</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Some
random comments to a long thread –</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
believe a number of commercial lipo applications
specifically limit “full charge” voltage to less than 4.2
volts, and limit “discharged” voltage to something higher
than 3.5 volts. Operating the lipo in the middle of the
voltage range increases longevity and reduces the odds of
failure. I’ve asked a number of “experts” if RC
applications would be better served by operating between
4.2 and 3.75 (typical), or 4.15 and 3.7, or 4.3 and
3.8……never received a clear answer. Hyperion is another
lipo supplier that has been advertising 4.35 volt
capability for several months now on their latest
generation of lipo cell.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">ThunderPower
might know the most about charging lipos for RC use, since
they have been doing it as long as anyone? The earliest
viable packs for pattern use were various “4p”
configurations. Early lipo cells could not support high
discharge rates, so putting cells in parallel was the only
option to support high discharge rates - even then, the
first pattern packs had a 6C BURST rating. ThunderPower
moved away from the “4p” configurations as soon as it was
viable to do so.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
don’t personally like the idea of parallel charging…simply
because I want to see the voltage of each cell….and mah to
recharge each pack…which is also part of the reason why I
run the TP5s5000 packs instead of the 5s5400s (which are
actually 10 2700s in 5s2p configuration). Tracking the
voltage at the end of a flight vs the mah needed to
recharge tells you quite a bit about the actual capacity
of the cells.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Several
years ago, I tried 2C charging (packs were rated for
5C charging). I have not done it since, as I believe
2C charging reduced the lifecycles of the packs by
about 30%. I’ll also note that with smaller packs
used for indoor flying, 3C charging seems to have
negligible impact on lifecycle. When time allows, I
charge my pattern packs at 3.5 amps…figuring if 1C
charging is better than 2C charging…. 0.7C
charging might be better yet.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The
number of good chargers out there is far greater than
in the past….the weak point with all of the chargers /
charging systems is the balance connectors….they wear
out, get dirty, etc, causing false readings in the
chargers.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Solid
power supplies are much cheaper than in the past. If
I needed a new power supply, I’d go for a pair of the
75 amp HP server power supplies (contact RVP….he has
them cheap with leads attached)….lots of charging
power, compact, and easy to put a pair in series for
1800 watts of power (more than a 15 amp household
circuit)…..enough to comfortably power a wide range of
charging schemes. I currently have 2 different
charger boxes….one has a pair of IOTA 55 amp supplies
in series running a pair of TP820s, and the newer
charger box has a pair of HP 47 amp supplies (much
lighter) in series running a pair of TP820s. Both
charger boxes have more than enough overhead (chargers
and supplies) to charge 4 5s5000s at 2C, should I need
to charge rapidly. Wiring to and from the power
supplies becomes increasingly critical as the wattage
goes up….at a 1000 watts, plenty of computer monitor
power leads (intended for less than 100 watts) will
get hot. Power leads intended for the power supplies
have a lot more capacity.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Dave</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
NSRCA-discussion [<a moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>]
<b>On Behalf Of </b>Peter Vogel via NSRCA-discussion<br>
<b>Sent:</b> Friday, October 09, 2015 12:40 AM<br>
<b>To:</b> Robert L. Beaubien <<a
moz-do-not-send="true"
href="mailto:rob@koolsoft.com"><a class="moz-txt-link-abbreviated" href="mailto:rob@koolsoft.com">rob@koolsoft.com</a></a>>;
NSRCA List <<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
<b>Subject:</b> Re: [NSRCA-discussion] FW: 10s LiPo
Charger Recommendation</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If
you go to 4.35v/cell your 10s pack voltage is in excess of
that allowed by the rules by 1.5v<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Peter+<o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Sent
from
<a moz-do-not-send="true" href="http://aka.ms/Ox5hz3">Outlook</a><o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:12.0pt"> <o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:12.0pt">On
Thu, Oct 8, 2015 at 8:46 PM -0700, "Robert L. Beaubien via
NSRCA-discussion" <<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org"
target="_blank">nsrca-discussion@lists.nsrca.org</a>>
wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ed,
</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
have talked with a number of battery manufacturers
and while their batteries support as high as 9c
charge rates, every one recommend NOT charging any
higher than 2c charging rates. Anything higher,
while tolerated by the battery, would definitely
shorten the life of the battery. The best benefit
of parallel charging is not using a high C charge
rate, but that you are charging multiple batteries
at the same time. It reduces the need to have to
charge fast (at least for me).</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Also,
I’m looking forward to the coming HV Lipo packs
where you charge the cells to 4.35v/cell instead of
4.2v/cell. Turnigy ( <a moz-do-not-send="true"
href="http://hobbyking.com/hobbyking/store/__1415__85__Batteries_Accessories-Turnigy_BOLT_LiHV_.html">http://hobbyking.com/hobbyking/store/__1415__85__Batteries_Accessories-Turnigy_BOLT_LiHV_.html</a>
) has them already and GiantPower is close to
releasing their packs with these cells. They should
give a nice boost in performance for a similar
weight battery.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:-.25in"><span
style="font-family:"Calibri",sans-serif">-</span><span
style="font-size:7.0pt">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Robert
Beaubien</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:-.25in"><span
style="font-family:"Calibri",sans-serif">-</span><span
style="font-size:7.0pt">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Sr.
Software Architect</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:-.25in"><span
style="font-family:"Calibri",sans-serif">-</span><span
style="font-size:7.0pt">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Kool
Software LLC</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">“Dear
Algebra, Please stop asking us to find your X.
She's never coming back and don't ask Y.”</span><o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Ed
Alt [<a moz-do-not-send="true"
href="mailto:ed_alt@hotmail.com">mailto:ed_alt@hotmail.com</a>]
<br>
<b>Sent:</b> Thursday, October 8, 2015 6:10 PM<br>
<b>To:</b> Robert L. Beaubien <<a
moz-do-not-send="true"
href="mailto:rob@koolsoft.com"><a class="moz-txt-link-abbreviated" href="mailto:rob@koolsoft.com">rob@koolsoft.com</a></a>>;
NSRCA List <<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
<b>Subject:</b> RE: [NSRCA-discussion] FW: 10s
LiPo Charger Recommendation</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks
for the response Robert. I can definitely see
doing this at low to moderate C rates as with your
example. I might run a test to see what the
voltage difference is between parallel battery
sets at higher C rates, maybe around 4 to 5C. The
thing that I have in mind is, that depending on
how things are connected, what the resulting
resistance is in the path to the 2nd, 3rd, 4th
parallel pack and so forth, and what the charging
current is, then you might see a problem with some
packs charging more than others. If you keep the
the wiring lengths the same from the charger to
each pack, then there should not be an issue. An
example might be something resembling a bicycle
wheel, with the charger at the hub of the wheel,
and battery packs distributed around the hub with
one pack per "spoke".<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">However,
if you instead choose to wire it to resemble a
train track, with a relatively simple charger at
one end of the track and battery packs strung out
like railroad ties along the rails, then a issue
may exist at some point. The reason is that the
higher the charging current value is, the more
voltage drop there will be along the wiring from
one pack to the next, skewing the results from one
pack to the next. Now depending on how the
charger algorithm is designed, that may not
matter. For example, an improved charger design
could pulse the charging current on and off, and
during each brief "off" time, take no load voltage
readings that would be virtually unaffected by the
extra resistance in the wiring to the 2nd pack.
More sophisticated methods could be applied that
you might expect could vary from one brand or
model charger to the next, but this should
illustrate the point that results may vary
depending on a number of factors. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Careful
monitoring and not pushing C rates really high as
you have done will certainly tell you enough. If
someone wants to really push the limits without
incurring too much risk, my suggestion is that
they determine the wiring method based on an
understanding of how the charging system will be
able to measure what is happening. If your
charging system can monitor individual parallel
pack voltages and suss out how those separate
readings relate to the state of the group of
batteries, you get easily push C rates higher
without much regard to the wiring scheme (hub and
spoke vs RR track, if you will). If your charging
system lacks independent battery voltage sensors,
but is known to have an algorithm that can work
around that, also good. Personally, I wouldn't go
against any manufacturer's specific recommendation
to avoid parallel charging with their product. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ed<o:p></o:p></p>
</div>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<div>
<div class="MsoNormal" style="text-align:center"
align="center">
<hr align="center" size="2" width="100%">
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;margin-bottom:12.0pt">To:
<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">
nsrca-discussion@lists.nsrca.org</a><br>
Date: Thu, 8 Oct 2015 20:39:19 +0000<br>
Subject: Re: [NSRCA-discussion] FW: 10s LiPo
Charger Recommendation<br>
From: <a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>.<o:p></o:p></p>
<div>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
have done a lot of parallel charging this
year. I was originally worried about cell
balance charging this way when I started
so I closely monitored the cell voltages
before and after charging. I’m typically
charging 1800 75c 4s packs, 4 at a time at
14amps (2c per pack). Every check of the
cells after charging shows they balance
very well and are within .02 volts each
and I have about 100 cycles on each pack
this way. I use the RMRC ParaBoard ( <a
moz-do-not-send="true"
href="http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=84_387&products_id=2984"
target="_blank">
<a class="moz-txt-link-freetext" href="http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=84_387&products_id=2984">http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=84_387&products_id=2984</a></a>
). Certainly not the 10s packs used in
pattern, but charging them as 5s packs
would work nicely using this system.</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<p class="ecxmsonormal"
style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79">-</span><span
style="font-size:7.0pt;color:#1F4E79">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Robert
Beaubien</span><o:p></o:p></p>
<p class="ecxmsonormal"
style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79">-</span><span
style="font-size:7.0pt;color:#1F4E79">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Sr.
Software Architect</span><o:p></o:p></p>
<p class="ecxmsonormal"
style="text-indent:-.25in"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79">-</span><span
style="font-size:7.0pt;color:#1F4E79">
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79"> Kool
Software LLC</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">“Dear
Algebra, Please stop asking us to find
your X. She's never coming back and
don't ask Y.”</span><o:p></o:p></p>
</div>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid
#E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="ecxmsonormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
NSRCA-discussion [<a
moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"><a class="moz-txt-link-freetext" href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a></a>]
<b>On Behalf Of </b>Ed Alt via
NSRCA-discussion<br>
<b>Sent:</b> Thursday, October 8, 2015
12:54 PM<br>
<b>To:</b> Keith Hoard <<a
moz-do-not-send="true"
href="mailto:klhoard@outlook.com"><a class="moz-txt-link-abbreviated" href="mailto:klhoard@outlook.com">klhoard@outlook.com</a></a>>;
General pattern discussion <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org"><a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a></a>><br>
<b>Subject:</b> Re: [NSRCA-discussion]
FW: 10s LiPo Charger Recommendation</span><o:p></o:p></p>
</div>
</div>
<p class="ecxmsonormal"> <o:p></o:p></p>
<div>
<p class="ecxmsonormal">Although I haven't
done parallel charging, it seems like it
would be ok within certain limits. The
main limiting factor might be the path
resistance between parallel cells, but
really only in the case of high C rate
charging. That's a theory anyway. What
has your experience been at high C rates?
Does it seem to make much difference?<o:p></o:p></p>
</div>
<div>
<p class="ecxmsonormal"> <o:p></o:p></p>
</div>
<div>
<p class="ecxmsonormal">Ed<o:p></o:p></p>
</div>
<div>
<p class="ecxmsonormal"><br>
On Oct 8, 2015, at 3:09 PM, Keith Hoard
via NSRCA-discussion <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org"><a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a></a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="ecxmsonormal"> <o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
have found that the loudest detractors
of parallel charging have no
experience parallel charging. When I
ask them to point to an incident
where parallel charging caused a
problem, the answer is always “Well, I
read on the internet . . . “</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">.</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
do a lot of parallel charging, and
have no problem “putting the spurs” to
my packs during charge if I’m ready to
get in the air. To dispel one myth
right now, a good quality charger
**WILL** detect a bad cell during
parallel charging.
</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">(steps
up on soapbox) . . .
</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:14.0pt;font-family:"Berlin
Sans FB",sans-serif;color:red">**I
HAVE ACTUALLY SEEN IT WITH MY OWN EYES
AND CONFIRMED IT WITH FURTHER TESTS**</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:14.0pt;font-family:"Berlin
Sans FB",sans-serif;color:red">**PLEASE
DON’T KEEP REFERRING ME BACK TO “THE
INTERNET”**</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:14.0pt;font-family:"Berlin
Sans FB",sans-serif;color:red">**IF
YOU GIVE ME ONE OF YOUR CRAPPY PUFFED
UP PACKS, I’LL PUT IT ON WITH ONE OF
MY GOOD PACKS AND SHOW YOU**</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">OK,
with that statement out of the way . .
. . (steps down off soapbox) . . . .
</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">The
only time that bad cell **MAY** be
masked is if you are parallel charging
4 or 6 packs. In practical use, you
would only be parallel charging that
many batteries on very rare occasions,
perhaps once per season. Besides,
most chargers out there don’t have
enough ass to charge 6 pattern packs
in parallel and be done before sundown
anyway. However, you should not be
relying on your charger as the only
point in your routine to detect bad
cells.</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In
my experience, folks with bad cells
and puffy packs are doing a myriad of
other no-no’s. The worst is taking
their batteries home on a full charge
and letting them sit all week or all
winter. My soapbox finally broke down
on that one and now I just smile and
say “That’s too bad” and keep walking
down the flight line.
</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ironically,
the “straw that broke the camel’s
back” for me was an H1B German
Engineer who flies at our field asked
me how I keep my packs from puffing
up. Every time I said “storage charge
at the end of the day”, he would reply
“I don’t do that.” Then I said, “Yes,
that’s why your batteries are all
puffy and trashed.” To which he
replied “Yes, I charge my batteries to
100% before taking them home.” . . .
<Sigh> . . .</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
now understand how VW got busted.</span><o:p></o:p></p>
<p class="ecxmsonormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="ecxmsonormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
NSRCA-discussion [<a
moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"><a class="moz-txt-link-freetext" href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a></a>]
<b>On Behalf Of </b>Vicente Bortone
via NSRCA-discussion<br>
<b>Sent:</b> Thursday, October 8, 2015
13:16<br>
<b>To:</b> James Hiller <<a
moz-do-not-send="true"
href="mailto:jnhiller@earthlink.net"><a class="moz-txt-link-abbreviated" href="mailto:jnhiller@earthlink.net">jnhiller@earthlink.net</a></a>>;
General pattern discussion <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org"><a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a></a>><br>
<b>Subject:</b> Re: [NSRCA-discussion]
10s LiPo Charger Recommendation</span><o:p></o:p></p>
<p class="ecxmsonormal"> <o:p></o:p></p>
<p class="ecxmsonormal">For some reason TP
does not recommend parallel charging.
Probably because it is difficult to keep
track of each cell and values are
averaged. Is this really an important
factor? At this point I just following
instructions. This factor could
be important to decide what charger to
buy.<o:p></o:p></p>
<div>
<p class="ecxmsonormal"> <o:p></o:p></p>
</div>
<div>
<p class="ecxmsonormal">Vicente "Vince"
Bortone<br>
<br>
On Thursday, October 8, 2015, James
Hiller via NSRCA-discussion <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org"><a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a></a>>
wrote:<o:p></o:p></p>
<blockquote
style="border:none;border-left:solid
#CCCCCC 1.0pt;padding:0in 0in 0in
6.0pt;margin-top:5.0pt;margin-bottom:5.0pt">
<p class="ecxmsonormal">Plug &
play charge box from Progressive RC
(see photo).<br>
Parallel charging 5 flight packs in
one session while having a couple
cold ones!<br>
Jim<br>
<br>
<br>
-----Original Message-----<br>
From: NSRCA-discussion [<a
moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"><a class="moz-txt-link-freetext" href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a></a>]
On Behalf Of Dr. Michael Harrison,
DDS via NSRCA-discussion<br>
Sent: Thursday, October 08, 2015
9:46 AM<br>
To: 'Earl Haury'; 'General pattern
discussion'<br>
Subject: Re: [NSRCA-discussion] 10s
LiPo Charger Recommendation<br>
<br>
lol<br>
<br>
-----Original Message-----<br>
From: NSRCA-discussion [<a
moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"><a class="moz-txt-link-freetext" href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a></a>]
On Behalf Of Earl Haury via
NSRCA-discussion<br>
Sent: Thursday, October 08, 2015
8:26 AM<br>
To: Budd Engineering; General
pattern discussion<br>
Subject: Re: [NSRCA-discussion] 10s
LiPo Charger Recommendation<br>
<br>
Jerry<br>
<br>
Hard to beat the iChargers. The
CellPros taught me that a fuse
between the pack & charger is a
good investment! No issues with
3010b iChargers (about<br>
3000 charges over 5 years or so).
They will report cell IR / voltage
and charge a 10S pack at 2C with a
24v supply without breaking a sweat.
The newer 4010 can handle 2x10S and
displays data from both packs
simultaneously. They don't meet your
criteria of charging through the
balance leads, but haven't really
found that to an issue as the
balancing system works fine. Can't
really comment on service, haven't
needed any (that should jinx me).<br>
<br>
Earl<br>
<br>
-----Original Message-----<br>
From: Budd Engineering via
NSRCA-discussion<br>
Sent: Thursday, October 08, 2015
4:59 AM<br>
To: List NSRCA-list<br>
Subject: [NSRCA-discussion] 10s LiPo
Charger Recommendation<br>
<br>
Hi all, I m in need of some
advice/suggestions for a new LiPo
charger for 10s packs.<br>
<br>
For the past several years I ve used
CellPro-10S chargers with good
results.<br>
However recently one of my
CellPro-10s' emitted the dreaded
magic smoke when I connected a 10s
pack for charging. This also
happened at the Nats 3 years ago,
fortunately Mike M. from F3AU was
there with inventory and I was able
to purchase a replacement charger
and press on. However, after having
a second one give up the ghost a few
weeks ago (and after not many charge
cycles - I don t fly very much), I m
interested in exploring other
options.<br>
<br>
<br>
To try to add some focus to this
here s my search constraints:<br>
<br>
1. It must be able to charge each
cell individually through the
balance connector, and give me a
relative readout of each cell s
condition compared to the other 9
cells.<br>
<br>
2. I m not interested in chargers
that have separate balancers from
the charger (e.g. like the TP1010C).<br>
<br>
3. Reliability and value are
important, as is ease of use.<br>
<br>
4. Cost no more than a replacement
CellPro 10XP (<$180), unless a
single charger can charge two 10s
packs simultaneously, then I d
consider spending a bit more.<br>
<br>
5. Customer service matters, if I
can buy it through F3A Unlimited,
that would be a PLUS.<br>
<br>
<br>
With this in mind does anyone have a
suggestion for what chargers I
should<br>
consider?<br>
<br>
<br>
I don t get out much these days so
it s difficult to see what everyone
s<br>
using that works well. So I really
do appreciate everyone s help with
this.<br>
<br>
Thx, Jerry<br>
_______________________________________________<br>
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</blockquote>
</div>
<p class="ecxmsonormal"><br>
<br>
-- <br>
Vicente "Vince" Bortone<o:p></o:p></p>
</div>
</blockquote>
<blockquote
style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="ecxmsonormal">_______________________________________________<br>
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<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><br>
_______________________________________________
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</div>
</blockquote>
</div>
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<br>
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<pre wrap="">_______________________________________________
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