[NSRCA-discussion] LI-IO packs

[Scott McHarg]

They came with the plane?  :)


On Thu, Oct 31, 2013 at 4:23 PM, John Gayer <jgghome at comcast.net> wrote:

> No, Lithium-Ion cells appear to be expensive, heavy lipos. both seem to
> charge to approximately 4.2.
> http://en.wikipedia.org/wiki/**Lithium_ion_battery#Charge_**and_discharge<http://en.wikipedia.org/wiki/Lithium_ion_battery#Charge_and_discharge>
> http://en.wikipedia.org/wiki/**Lithium_polymer_battery<http://en.wikipedia.org/wiki/Lithium_polymer_battery>
>
> 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?
> John
> On 10/31/2013 1:21 PM, joddino at socal.rr.com wrote:
>
>> ---- Daniel Dupont <dansy44 at gmail.com> wrote:
>>
>>> So Jim if I understand correctly Lithium-ion cells are basically cheap
>>> Lipo¹s?
>>>
>>> Hum I always believed they were a slightly different technologyŠ.
>>>
>>> Daniel on MacBook Pro
>>>
>>>
>>>
>>>
>>> On 10/31/2013, 1:46 PM, "joddino at socal.rr.com" <joddino at socal.rr.com>
>>> wrote:
>>>
>>>  ---- Scott McHarg <scmcharg at gmail.com> wrote:
>>>>
>>>>> Morning y'all,
>>>>>
>>>>> I've spoken to a few people about charging Lithium Ion packs but we did
>>>>> not
>>>>> arrive at a definitive answer.  I need to understand what the best
>>>>> solution
>>>>> (besides buying another charger) is for my situation.
>>>>>
>>>>> I consider myself fairly knowledgeable about the Cellpro 10XP.
>>>>>  Usually,
>>>>> it's me giving the help but I'm not sure what to do here.  Here's the
>>>>> scenario:
>>>>>
>>>>>   Cellpro 10XP Multi-Chemistry Charger.  The User Manual and everything
>>>>> about the charger says that it can charge the ION packs.  So, I go to
>>>>> program a preset for this but in the software, there is nothing that
>>>>> says
>>>>> anything about ION packs.  There is LiPo, Pb, A123, Ni-Cd, and Nickel
>>>>> Metal.  I have some ION 7.4V 5200mah packs that I need to charge and a
>>>>> 2600mah pack for the ignition on a 42% Edge 540.  The packs are made of
>>>>> 4
>>>>> cells but are wired so that they are only 2 (2 in series, 2 in
>>>>> parallel)
>>>>> cells.  As close as I can tell, I should select the LiPo 2sU (2 cell
>>>>> unbalanced) but I don't want to make a mistake.  Someone told me that
>>>>> would
>>>>> be OK and another said that if you program the charger by the charger
>>>>> instead of the software, there is an ION setting but I haven't
>>>>> confirmed
>>>>> that yet as it was late last night when I was checking.
>>>>>
>>>>> Anyone have any idea what to do to charge these packs?
>>>>>
>>>>> Thanks,
>>>>>
>>>>> --
>>>>> *Scott A. McHarg*
>>>>> Sr. Systems Engineer - Infrastructure
>>>>>
>>>> If they are lithium-ion cells they should be charged to 4.2 volts per
>>>> cell or 8.4 volts for a 2s pack.  Lithium polymer cells are lithium ion
>>>> and are charged the same.  My Cellpro charger charges to 4.204 volts per
>>>> cell when set for LiPo packs and that is what should be used for Lithium
>>>> ion.  The Lithium ion cells generally have higher internal resistance
>>>> and
>>>> therefore can not be discharged or charged at high rates.  I use one C
>>>> max.
>>>>
>>>> Jim O
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>>>>
>>>
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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.
>>
>> Jim O
>>
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>>
>
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-- 
*Scott A. McHarg*
Sr. Systems Engineer - Infrastructure
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