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Thanks, Jon.<br>
Good reason to have Lions in the 42% Carden, then. I do believe that
Scotts have no balance connectors. I'm using Lipos in a 37% Extra
but they are well wrapped in foam.<br>
John<br>
<div class="moz-cite-prefix">On 10/31/2013 3:54 PM, Jon Lowe wrote:<br>
</div>
<blockquote
cite="mid:8D0A49AEE5ABF67-1C98-24ABF@webmail-d145.sysops.aol.com"
type="cite"><font color="black" face="Arial, Helvetica,
sans-serif" size="3">
<div><font style="background-color: transparent;" face="Arial,
Helvetica, sans-serif">Lithium ion (LiIo) cells are more
rugged than lithium polymer. I won't use lipo receiver
batteries in a fuel airplane because of the aluminum foil
tabs that serve as positive and negative terminals. Seen
too many failures. I used lithium ion batteries from
Central (NMP) when I flew YS. Never had a failure due to
the cells themselves. Lithium ions will still burn if
overcharged, but mechanically are much more rugged. As Jim
Oddino said, lipos are good for fast discharging. LiIo's
are great for less demanding current draw, such as
receiver/servo packs. Even with a regulator, they are still
lighter than NiMh packs. The LiIo cells sold for RC use are
identical to those used in most laptop computers, although
newer ultrathin laptops have started using LiPo's.</font></div>
<div> </div>
<div>For a long time, 2 cell Lilo packs came without balance
plugs. Later ones from NMP do. I recommend balance charging
2 cell lithium ion packs at least occasionally, because a few
I've had have gone out of balance.</div>
<div style="clear: both;"><font color="black" face="Arial,
Helvetica, sans-serif"><font color="black" face="arial"><span
class="Apple-style-span" style="font-size: medium;">Jon</span></font></font></div>
<div style="color: black; font-family: arial,helvetica;
font-size: 10pt;">-----Original Message-----<br>
From: Scott McHarg <a class="moz-txt-link-rfc2396E" href="mailto:scmcharg@gmail.com"><scmcharg@gmail.com></a><br>
To: General pattern discussion
<a class="moz-txt-link-rfc2396E" href="mailto:nsrca-discussion@lists.nsrca.org"><nsrca-discussion@lists.nsrca.org></a><br>
Sent: Thu, Oct 31, 2013 4:33 pm<br>
Subject: Re: [NSRCA-discussion] LI-IO packs<br>
<br>
<div id="AOLMsgPart_2_78b78908-bd6a-4605-8f7e-ab201c2a88d2">
<div dir="ltr">
<div class="gmail_default" style="color: rgb(0, 0, 255);
font-family: comic sans ms,sans-serif;">They came with
the plane? :)</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Thu, Oct 31, 2013 at 4:23 PM,
John Gayer <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:jgghome@comcast.net">jgghome@comcast.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0px 0px
0px 0.8ex; padding-left: 1ex; border-left-color:
rgb(204, 204, 204); border-left-width: 1px;
border-left-style: solid;">No, Lithium-Ion cells
appear to be expensive, heavy lipos. both seem to
charge to approximately 4.2.<br>
<a moz-do-not-send="true"
href="http://en.wikipedia.org/wiki/Lithium_ion_battery#Charge_and_discharge"
target="_blank">http://en.wikipedia.org/wiki/Lithium_ion_battery#Charge_and_discharge</a><br>
<a moz-do-not-send="true"
href="http://en.wikipedia.org/wiki/Lithium_polymer_battery"
target="_blank">http://en.wikipedia.org/wiki/Lithium_polymer_battery</a><br>
<br>
There appears to be a weight and price penalty
associated with the litium-ion battery over the
lithium-polymer battery with no benefit. Perhaps
someone can explain the popularity of lithium-ion?<br>
John<br>
On 10/31/2013 1:21 PM, <a moz-do-not-send="true"
href="mailto:joddino@socal.rr.com">joddino@socal.rr.com</a>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0px 0px
0px 0.8ex; padding-left: 1ex; border-left-color:
rgb(204, 204, 204); border-left-width: 1px;
border-left-style: solid;">
---- Daniel Dupont <<a moz-do-not-send="true"
href="mailto:dansy44@gmail.com">dansy44@gmail.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0px
0px 0px 0.8ex; padding-left: 1ex;
border-left-color: rgb(204, 204, 204);
border-left-width: 1px; border-left-style: solid;">
So Jim if I understand correctly Lithium-ion cells
are basically cheap<br>
Lipo¹s?<br>
<br>
Hum I always believed they were a slightly
different technologyŠ.<br>
<br>
Daniel on MacBook Pro<br>
<br>
<br>
<br>
<br>
On 10/31/2013, 1:46 PM, "<a moz-do-not-send="true"
href="mailto:joddino@socal.rr.com">joddino@socal.rr.com</a>"
<<a moz-do-not-send="true"
href="mailto:joddino@socal.rr.com">joddino@socal.rr.com</a>><br>
wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin: 0px
0px 0px 0.8ex; padding-left: 1ex;
border-left-color: rgb(204, 204, 204);
border-left-width: 1px; border-left-style:
solid;">
---- Scott McHarg <<a moz-do-not-send="true"
href="mailto:scmcharg@gmail.com">scmcharg@gmail.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:
0px 0px 0px 0.8ex; padding-left: 1ex;
border-left-color: rgb(204, 204, 204);
border-left-width: 1px; border-left-style:
solid;">
Morning y'all,<br>
<br>
I've spoken to a few people about charging
Lithium Ion packs but we did<br>
not<br>
arrive at a definitive answer. I need to
understand what the best<br>
solution<br>
(besides buying another charger) is for my
situation.<br>
<br>
I consider myself fairly knowledgeable about
the Cellpro 10XP. Usually,<br>
it's me giving the help but I'm not sure what
to do here. Here's the<br>
scenario:<br>
<br>
Cellpro 10XP Multi-Chemistry Charger. The
User Manual and everything<br>
about the charger says that it can charge the
ION packs. So, I go to<br>
program a preset for this but in the software,
there is nothing that<br>
says<br>
anything about ION packs. There is LiPo, Pb,
A123, Ni-Cd, and Nickel<br>
Metal. I have some ION 7.4V 5200mah packs
that I need to charge and a<br>
2600mah pack for the ignition on a 42% Edge
540. The packs are made of<br>
4<br>
cells but are wired so that they are only 2 (2
in series, 2 in parallel)<br>
cells. As close as I can tell, I should
select the LiPo 2sU (2 cell<br>
unbalanced) but I don't want to make a
mistake. Someone told me that<br>
would<br>
be OK and another said that if you program the
charger by the charger<br>
instead of the software, there is an ION
setting but I haven't confirmed<br>
that yet as it was late last night when I was
checking.<br>
<br>
Anyone have any idea what to do to charge
these packs?<br>
<br>
Thanks,<br>
<br>
-- <br>
*Scott A. McHarg*<br>
Sr. Systems Engineer - Infrastructure<br>
</blockquote>
If they are lithium-ion cells they should be
charged to 4.2 volts per<br>
cell or 8.4 volts for a 2s pack. Lithium
polymer cells are lithium ion<br>
and are charged the same. My Cellpro charger
charges to 4.204 volts per<br>
cell when set for LiPo packs and that is what
should be used for Lithium<br>
ion. The Lithium ion cells generally have
higher internal resistance and<br>
therefore can not be discharged or charged at
high rates. I use one C<br>
max.<br>
<br>
Jim O<br>
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</blockquote>
<br>
_______________________________________________<br>
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href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
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target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
</blockquote>
The first Li-Ion cells used in the RC industry were
packaged in metal cylindrical cans similar to NiCds.
Then the packs packaged in flexible plastic sacks
arrived for use in powering motors. These came to
be referred to as LiPo packs but basically used the
same chemistry but also had the advantage of having
low internal resistance. Since those early days
many other chemistries with different fully charged
voltages have arrived and many charger suppliers
have tried to cover them as well. The voltages
printed on the packs are typically a nominal voltage
and might be 7.2, 7;4 or 7.6 volts even though the
full charge voltage is 8.4. I suspect the cells
referred to here have the metal cans and that is why
they are described as Li-Ion. Hope this helps.<br>
<br>
Jim O<br>
<br>
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</blockquote>
<br>
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target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
<b style="color: rgb(51, 51, 255);"><font
style="font-family: comic sans ms,sans-serif;"
size="4">Scott A. McHarg</font></b><br>
Sr. Systems Engineer - Infrastructure<br>
</div>
</div>
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