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Old 09-01-2008, 12:44 PM   #1
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Default Warming lipo batteries?

OK, new to Lipo.

My question is, is there an advantage to warm the lipo during charging?

Reading the IIC race thread there was discussion about only allowing I think it was 110deg temp and 8.44 volts.

My question is do you need to warm Lipo and how is a safe way to do it? Someone I think mentioned a snake warmer or old fashon heat pad.

Any pics would be appreciated on a safe way to do this if it's even needed.

Thanks.
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Old 09-01-2008, 01:41 PM   #2
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i'd say charge em per manufacturers' suggestion and be safe. also is important if your track is teching lipo voltages for folks pushin the envelope too far.

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Old 09-01-2008, 03:39 PM   #3
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I don't think it's worth the risk if your road racing. Clip a board and you've just handed back whatever advantage you gained.
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Old 09-01-2008, 03:46 PM   #4
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Theres a guy local to us that is warming them. To be honest it really does seem to give him more punch. Now I couldnt say if he actually has more voltage or not, but he has a lot of power.
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Old 09-01-2008, 04:06 PM   #5
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hey guys if the manufacturer wanted you to warm the cells before a race it would be in the instructions.
Remember the hotter the battery the less life
I have SMC 4000s i charge @ the correct rate which is 4amps, never overheats infact it is flatout getting warm, and plenty of punch and runtime for mod (mamba 7700 and lrp 4.5)
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Old 09-01-2008, 04:43 PM   #6
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True it may very well shorten the battery life. But apparently some people are noticing power gains that make it worth your while. Im not endorsing something that may get you hurt, but Im not going to lie and say theres no advantage either. RC racing has pushed battery technology for as long as I can remember. If you dont believe me then you have probably never seen a NiCad cell blow a Hornet in half.
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Old 09-01-2008, 05:31 PM   #7
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I'm really dig not having to bring a whole tub of crap to the track for charging. Until it makes half a volt difference, it just isn't worth it. These batteries are sort of expensive and work pretty friggin awesome at room temperature.

Club racing isn't worth the headache/risk/$$, but A-main at the 'Birds, I'm all in.
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Old 09-02-2008, 06:53 AM   #8
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The recommed operating temp for Lipo's is 60-100degF.

Which is basically room temperature and a bit above.

Would have thought indoors or at most meets in USA heating wasn't needed.

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Old 09-02-2008, 08:10 AM   #9
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Default Warming

Warming lipo's does help the voltage alot. I use a heating pad and get them about 120 f . I did a back to back comparison on a turbo35 gfx at 35 amps and the voltage was .5 higher warmed.
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Old 09-02-2008, 08:24 AM   #10
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Sounds a very bad idea IMO. It will most definately shorten the pack's life. If you need more power, go with a pack that has an additional cell or a motor w/ less resistance. Heat is an enemy of pretty-much everything electronic.
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Old 09-02-2008, 09:26 AM   #11
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At this point I don't think people care about whether or not they shorten the life of their Lipo packs by warming them. They are already out lasting the life of NiMh batteries competitive life and most people will do whatever is necessary to win. It is a mind game that people play.

Bottom line, it does help but use your head and don't burn the place down or melt the case if you decide to do this. If you do warm your packs then be ready to replace them more frequently.
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Old 09-02-2008, 09:27 AM   #12
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Quote:
Originally Posted by luvminis View Post
Sounds a very bad idea IMO. It will most definately shorten the pack's life. If you need more power, go with a pack that has an additional cell or a motor w/ less resistance. Heat is an enemy of pretty-much everything electronic.
In Stock classes this isn't an option. For bashing, yeah it's not needed. But when racing, you can't add cells and if you're in a stock class, you can't run a hotter motor.

It does make a difference. That's for sure. I'm not advocating it. But I do know that it is a measurable difference. It's about the same as keeping your nimh's nice and warm right before your heat. Yeah it shortens the life, but ya go faster!
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Old 09-02-2008, 09:28 AM   #13
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I have tried this, and noticed more punch out of the pack. But, my freind also tried it, and he swelled his Checkpoint pack (case and all), so after that, no more heating pad for me.
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Old 09-02-2008, 09:55 AM   #14
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Quote:
Originally Posted by luvminis View Post
Sounds a very bad idea IMO. It will most definately shorten the pack's life. If you need more power, go with a pack that has an additional cell or a motor w/ less resistance. Heat is an enemy of pretty-much everything electronic.
everything except batteries. ever run a pack fresh off the charger(nimh), and then run one thats been sitting for an hour, and wonder why your car felt slower? its cause the pack cooled off. the point of heating the battery is that when its warm the chemicals in the cells are more active, and it makes the pack perform better. the same holds true with lipos. not sure on the effects on the lifetime (havent had one to use myself)
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Old 09-02-2008, 01:22 PM   #15
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I do not suggest anyone to try this unless they are ready for the consequences.

If anyone remembers from chemistry class, a way to increase a chemical reactions speed is to heat it up. Batteries use chemical reactions to produce electricity, so if these chemical reactions are sped up, a little more performance could result. If a battery can go through its reaction quicker, it can deliver more amperage.

I'm now tempted to try, but otherwise i would discourage this.
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