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Old 03-06-2009, 07:57 AM   #1
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Default storing lipo's in the cold

I have heard rummors that storing a lipo in freezing conditions is bad for the cells and the pack will loose power from it. Is this true?
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Old 03-06-2009, 08:08 AM   #2
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I'll believe it. When I keep my gear in my car on a cold winter day while at work, I find the first cycle through my packs when I get to the track are below normal performance. Once they warm up, they come around.

Lipos put out more voltage when they are warm. Hence the reason some on-road guys are charging in a heating pad. I'm no expert, but it stands to reason that if the packs perform better warm, they will perform worse cold. It seems that way from my experience.
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Old 03-06-2009, 09:31 AM   #3
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i've kept my gear in my car for weeks on end and never noticed anything but i guess thats why they sell lipo warmers. pretty funny how how we went from trying to keep our nimh batts cool to wanting to keep our llipos warm
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Old 03-06-2009, 09:43 AM   #4
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yes. i left 2 small 3S lipos in my shed over the winter last yr. forgot they were out there.

in spring both were dead as a doorknob. one has puffed up a bit, both are junk.
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Old 03-06-2009, 10:23 AM   #5
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lipos store best at 40% charge in a fridge, but that's only over long periods of time. otherwise, I don't think it matters.
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Old 03-06-2009, 07:36 PM   #6
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Think I've read 50F is where lipo performance falls off - its something plane guys deal with flying in the winter. They keep their lipos warm, but once airborne, with all the cooling, temps fall and they can see performance fall off when the lipo cools down.

Also think I've read lipo performs best at 110F.
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Old 03-06-2009, 07:39 PM   #7
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i heard that chargeing them at 110-120 degrees then running them at around those temps. they say you get better performance out of it
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Old 03-07-2009, 01:51 AM   #8
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lipos are death i keep my 2 cell lipos for my rc18t in a lipo charge bag when they aren't in my truck i had one start to HHHIIIISSSSSS one day and i thought i was done for the way people talk about these things so i went out and bought a bag for them but as for your question i'd say keep them above freezing and below 200 but thats just me
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Old 03-07-2009, 03:48 AM   #9
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For storage the ideal temperature is about 0C-5C (less loss of capacity over time) also important when your done using them for the day don't bother to charge them back up leave them about ~40% charge which also furthers their life before the capacity drops. For performance, the ideal temperatures is about 50-60C afaik, bring them up to temperature before you charge them before your race/bash.
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Old 03-07-2009, 08:38 AM   #10
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Quote:
Originally Posted by trickedyfz450 View Post
I have heard rummors that storing a lipo in freezing conditions is bad for the cells and the pack will loose power from it. Is this true?
Rumors?
I haven't heard of a battery yet that recommended freezing as normal storage procedure.
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Old 03-07-2009, 08:41 AM   #11
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Quote:
Originally Posted by tazeat View Post
For storage the ideal temperature is about 0C-5C (less loss of capacity over time) also important when your done using them for the day don't bother to charge them back up leave them about ~40% charge which also furthers their life before the capacity drops. For performance, the ideal temperatures is about 50-60C afaik, bring them up to temperature before you charge them before your race/bash.
for those who dont know how to convert its ruffly times 2 + 40.

so 50c= 140f / 50 x 2=100 + 40= 140
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Old 03-07-2009, 09:48 PM   #12
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Quote:
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for those who dont know how to convert its ruffly times 2 + 40.

so 50c= 140f / 50 x 2=100 + 40= 140
That's just what I've read, I've never actually heated my batteries before use, but I usually make sure they are room temperature or better.
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Old 03-07-2009, 10:20 PM   #13
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Here's some Info. on Storage as far as charge and temp.

Read number 4.

http://rclovers.com/GetTheMostFromLipo.htm
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Old 03-07-2009, 10:54 PM   #14
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Quote:
Originally Posted by *Chrominator* View Post
Here's some Info. on Storage as far as charge and temp.

Read number 4.

http://rclovers.com/GetTheMostFromLipo.htm
thats some good info man
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Old 03-08-2009, 03:30 AM   #15
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Quote:
Originally Posted by *Chrominator* View Post
Here's some Info. on Storage as far as charge and temp.

Read number 4.

http://rclovers.com/GetTheMostFromLipo.htm
+2

I've made it known around my local track that I DO NOT push my LiPo packs in any way. Always charge at 1C and always stored and charged inside my LiPoSack, and since I already have a balancer I figure I might as well use it (plus the little fuel gauge on the balancer is good for guesstimating how far along the pack is during a charge). My LiPos ride with me in the cab of my truck as opposed to back in the hot in summer/cold in winter bed with the rest of my gear, and between race nights they stay on a shelf in my basement shop.

I'd rather have people tell me I'm paranoid than tell me I'm missing my eyebrows
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