[NSRCA-discussion] LI-IO packs
John Gayer
jgghome at comcast.net
Thu Oct 31 13:53:32 AKDT 2013
Yeah, it was a general question. I really would like to know why LI-IONs
are purchased and the perceived advantage?
Scott, I think you should immediately throw them in the trash and
replace them with the most expensive lipos you can find. :)
On 10/31/2013 3:43 PM, Dansy44 wrote:
> Ahah I don't think he was talking specifically about you :))
>
> Sent from Daniel iPad 2
>
> On Oct 31, 2013, at 16:32, Scott McHarg <scmcharg at gmail.com
> <mailto:scmcharg at gmail.com>> wrote:
>
>> They came with the plane? :)
>>
>>
>> On Thu, Oct 31, 2013 at 4:23 PM, John Gayer <jgghome at comcast.net
>> <mailto: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_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
>> <mailto:joddino at socal.rr.com> wrote:
>>
>> ---- Daniel Dupont <dansy44 at gmail.com
>> <mailto: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
>> technologyS(.
>>
>> Daniel on MacBook Pro
>>
>>
>>
>>
>> On 10/31/2013, 1:46 PM, "joddino at socal.rr.com
>> <mailto:joddino at socal.rr.com>" <joddino at socal.rr.com
>> <mailto:joddino at socal.rr.com>>
>> wrote:
>>
>> ---- Scott McHarg <scmcharg at gmail.com
>> <mailto: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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>>
>> 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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>>
>>
>>
>> --
>> *Scott A. McHarg*
>> Sr. Systems Engineer - Infrastructure
>> _______________________________________________
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>> NSRCA-discussion at lists.nsrca.org
>> <mailto:NSRCA-discussion at lists.nsrca.org>
>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
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