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Old Dec 22, 2003, 08:42 PM
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Lipo gets cold while charging

I have one TP2100 3s pack that actually gets very cold when I charge it on my Triton at 1c, 2.1 amps It seems to perform o-k, it just get extremely cold while charging. What is the cause of this?
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Old Dec 22, 2003, 09:45 PM
radar jammer
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Bradenton, Florida
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New Peltier LiPo tech?

Double check to see if the otherside gets hot
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Old Dec 23, 2003, 07:09 AM
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Dundas, ON Canada
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Perhaps the chemistry is such that charging is endothermic.

Rob
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Old Dec 23, 2003, 10:07 AM
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Quote:
Originally posted by Greebe
New Peltier LiPo tech?

Double check to see if the otherside gets hot
The whole pack gets cold, but when I fly it, it gets barely warm>
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Old Dec 23, 2003, 11:22 AM
radar jammer
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Bradenton, Florida
Joined May 2003
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I was being facetious.

Never heard of any battery going cold on a charge. Would suggest contacting the manufacture
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Old Dec 23, 2003, 12:16 PM
know it all
Miami, Fl
Joined Nov 2003
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nicads do it all the time.. its an endothermic reaction. Dont know about lipos.

Quote:
Originally posted by Greebe
I was being facetious.

Never heard of any battery going cold on a charge. Would suggest contacting the manufacture
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Old Dec 23, 2003, 12:26 PM
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Bradenton, Florida
Joined May 2003
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Should have said, never have seen a LiPo going cold... sigh
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Old Jan 26, 2010, 11:23 AM
I can drift a heli
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USA, CA, Sacramento
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I have been charging my lipo's in a 40F garage durring the winter. Would they charge faster if I charged them inside? I know dumb question but just wondering
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Old Jan 26, 2010, 11:32 AM
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Probably not much difference, but batteries like to be at room temperature when being charged/discharged.
Quote:
Originally Posted by maarset View Post
I have been charging my lipo's in a 40F garage durring the winter. Would they charge faster if I charged them inside? I know dumb question but just wondering
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Old Jan 26, 2010, 11:52 AM
I can drift a heli
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USA, CA, Sacramento
Joined Mar 2005
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Ok thanks. Yah I have been charging them in the cold garage and on a cold piece of granite. I might try and charge inside tonight. My charger has a temp sensor that I always use like religion.
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Old Jan 26, 2010, 12:53 PM
Southern Pride
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Haralson County GA. USA
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Quote:
Originally Posted by maarset View Post
I have been charging my lipo's in a 40F garage durring the winter. Would they charge faster if I charged them inside? I know dumb question but just wondering


Some say trhat LiPolys should not be charged past 4.1 volts per cell if they are below 50F. The FMA chargers automaticly reduce the max. charge to voltage if the charger detects 50F or below.

Charles
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Old Jan 26, 2010, 01:06 PM
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United States, CA, Bear Valley Springs
Joined Feb 2000
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I've heard that if lipos are charged cold to 4.2 volts, as the chemistry warms up the voltage can rise a bit.
Anyone else heard that one? I suppose that could be also true for other chemistries.

mw
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Old Jan 26, 2010, 02:52 PM
Eggs @ Tea
Dover DE USA
Joined Feb 2007
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most of my packs do this cold effect.... guess I'm nuts or something by touching them every 10-15 mins, they start getting cooler when i first started balancing my packs they get very cool to the touch, I think its a good thing.... some of my smaller packs will get warm around the 4.1 4.2 a cell.... I keep my packs when I'm away from home around 3.75 a cell and they never drop at all till i charge them up again: .... cool: my oldest packs still will charge (2-3 years old) about 65-70 mins and have a fill up around 3/4 of mah.... scott
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Old Jan 26, 2010, 03:09 PM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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There is a big difference between stating as the OP did
that

Quote:
Lipo gets cold while charging
and the normal cooling during charging of a warm LiPoly.

Yes many of my LiPolys are in fact 115 to 130F after a discharge(flight / test) and yes the cool during the charge. Charging LiPolys generates very little heat so it is perfectly normal for a LiPoly to cool from say 115F to 80F at room temp. during a charge. Simple fact is it would also cool the same amount or perhaps a few degrees more just sitting at room temp.


Charles
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Old Jan 26, 2010, 03:13 PM
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gawler, South Australia
Joined Jul 2006
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Hey


Recently it has been hot here and we are trying to keep our lipo's cool, I am storing mine in my fridge away from day temps of 30-40+ c.
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