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Yeah, it was a general question. I really would like to know why
LI-IONs are purchased and the perceived advantage?<br>
Scott, I think you should immediately throw them in the trash and
replace them with the most expensive lipos you can find. :)<br>
<div class="moz-cite-prefix">On 10/31/2013 3:43 PM, Dansy44 wrote:<br>
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<div>Ahah I don't think he was talking specifically about you :))<br>
<br>
Sent from Daniel iPad 2</div>
<div><br>
On Oct 31, 2013, at 16:32, Scott McHarg <<a
moz-do-not-send="true" href="mailto:scmcharg@gmail.com">scmcharg@gmail.com</a>>
wrote:<br>
<br>
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<div class="gmail_default" style="font-family:comic sans
ms,sans-serif;color:#0000ff">They came with the plane? :)</div>
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<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" target="_blank">jgghome@comcast.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">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" target="_blank">joddino@socal.rr.com</a>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
---- Daniel Dupont <<a moz-do-not-send="true"
href="mailto:dansy44@gmail.com" target="_blank">dansy44@gmail.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
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" target="_blank">joddino@socal.rr.com</a>"
<<a moz-do-not-send="true"
href="mailto:joddino@socal.rr.com" target="_blank">joddino@socal.rr.com</a>><br>
wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
---- Scott McHarg <<a moz-do-not-send="true"
href="mailto:scmcharg@gmail.com" target="_blank">scmcharg@gmail.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
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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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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-- <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>
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