Lipo gets cold while charging - RC Groups
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Dec 22, 2003, 09:42 PM
Parrothead Extraordinaire
Mark Gund's Avatar

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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Dec 22, 2003, 10:45 PM
radar jammer
Greebe's Avatar
New Peltier LiPo tech?

Double check to see if the otherside gets hot
Dec 23, 2003, 08:09 AM
Registered User
rscamp's Avatar
Perhaps the chemistry is such that charging is endothermic.

Rob
Dec 23, 2003, 11:07 AM
Parrothead Extraordinaire
Mark Gund's Avatar
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>
Dec 23, 2003, 12:22 PM
radar jammer
Greebe's Avatar
I was being facetious.

Never heard of any battery going cold on a charge. Would suggest contacting the manufacture
Dec 23, 2003, 01:16 PM
know it all
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
Dec 23, 2003, 01:26 PM
radar jammer
Greebe's Avatar
Should have said, never have seen a LiPo going cold... sigh
Jan 26, 2010, 12:23 PM
I can drift a heli
maarset's Avatar
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
Jan 26, 2010, 12:32 PM
Registered User
Probably not much difference, but batteries like to be at room temperature when being charged/discharged.
Quote:
Originally Posted by maarset
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
Jan 26, 2010, 12:52 PM
I can drift a heli
maarset's Avatar
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.
Jan 26, 2010, 01:53 PM
Southern Pride
everydayflyer's Avatar
Quote:
Originally Posted by maarset
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
Jan 26, 2010, 02:06 PM
characters welcome!
Mark Wood's Avatar
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
Jan 26, 2010, 03:52 PM
Eggs @ Tea
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
Last edited by SmoothCruizer2; Jan 26, 2010 at 03:57 PM.
Jan 26, 2010, 04:09 PM
Southern Pride
everydayflyer's Avatar
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
Jan 26, 2010, 04:13 PM
Registered User
rcozstyle's Avatar
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.