[NSRCA-discussion] LiPo Fun Fact 'O The Day

[Ed Alt]

Yes, of course they cool down in that scenario.  They aren't generating enough heat during charging to maintain the temperature they just reached during discharge, so they dissipate the excess heat energy through radiation and to the lower temperature air around them.  They just cool down slightly more slowly than if you had allowed them to cool down without recharging.

> On Oct 9, 2015, at 9:19 PM, Atwood, Mark via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> 
> Apparently you guys never put them on charge when they're hot!!  Then they definitely cool down while charging.  :)
> 
> Sent from my average intelligence  phone
> 
> 
> On Oct 9, 2015, at 8:44 PM, Robert L. Beaubien via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> 
>> Ditto.  They get warmer even if unnoticed.
>>  
>> -           Robert Beaubien
>> -           Sr. Software Architect
>> -           Kool Software LLC
>>  
>> “Dear Algebra, Please stop asking us to find your X.  She's never coming back and don't ask Y.”
>>  
>> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ed Alt via NSRCA-discussion
>> Sent: Friday, October 9, 2015 5:11 PM
>> To: chuenkan at comcast.net; General pattern discussion <nsrca-discussion at lists.nsrca.org>
>> Subject: Re: [NSRCA-discussion] LiPo Fun Fact 'O The Day
>>  
>> They do warm up when charging, even at low rates.  It's the physics behind Ohms law that governs some of that.  It may not be very noticeable, but it is happening nonetheless.
>> 
>> On Oct 9, 2015, at 8:03 PM, Phil Spelt via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
>> 
>> I would say "C" below:  I have never had a lipo pack get warm during charging.  That's because i always charge somewhere between 1.8-2.0 C.  For my electric planes I buy enough batteries so I do not have to hurry-charge in order to get back into the air.  I charge the lipos in my starter & glow igniter at home in the shop when I have plenty of time.  Now, in the interest of full disclosure, I do not use $150.00 battery packs, and none of my electric planes are for pattern.
>>  
>> Phil Spelt, KCRC Emeritus, Secretary
>> AMA 1294, Scientific Leader Member
>> SPA L-18, Board Member
>> (865) 435-1476v  (865) 604-0541c
>>  
>>  
>> During charging, a LiPo battery becomes:
>>  
>> A)     Warmer
>> B)     Colder
>>         C)   None of the above
>>         D)  All of the above
>>  
>> --Keith Hoard
>> --klhoard at outlook.com
>>  
>> 
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