Soo umm that can't be good...

[redshift]

Ok I had too look it up, -20C is -4F. And I wouldn't want to be out playing in those temps for very long either.. but yeah it's either deal with it or not play.

I wonder if someone could come up with a cheap DIY self-powered electric blanket for winter lipo running lol. Seems like 10-15 watts would be enough to keep the packs warm and wouldn't really reduce runtime at all..

Maybe some heated gloves or socks modified to run off 1 or 2S?

[Slowkrawl]

Hmm, even one of those little packs you can stuff in your boot or whatever to keep your feet warm..But then if the thing ever tore, what kind of chemicals are we mixing? lol

[florianz]

sorry that that lipo puffed.

when it's cold outside, I take a plastic thermo bag (eg. for beer, sandwich), and some of those warming-pads. I put the lipos into the bag.

when I arrive at the spot (about 20 mins by car), all lipos are nicley warm, round about 30 deg. c. and the beer's warm, too...

very cold lipos have a high IR, that could possibly damage the esc, or even the lipo. and, you have not that much punch.

that bag worked well so far.

[JThiessen]

Originally Posted by redshift

Yep, too cold. You need to look into a heating pad or similar, and also find a way to insulate the batts, I use thin packing foam.

Packs preheated are crazy punchy and shouldn't puff due to low temp because they can't really cool back off as long as they start warm. You can't keep an eye on temps with hardcases and that's why I'd never run them. You really need to know what's going on with them during a run. If you sell them do yourself a huge favor and get noncased packs next time. The cases will do nothing to insulate them, and will contribute to overheating in the warmer months, double bad news.

While I agree with your overall theory, the last sentence is double speak - either they have no insulating qualities, or they do. If they dont insulate, then they also cant contribute to overheating (it all boils down to R value).

[redshift]

Haha it is indeed!

Good catch..

I should have said- the cases don't provide insulation in the cold, and they block cooling air in the heat.. and even that isn't 100%, but hardcases suck all around IMO.

I'm pretty firm on that at least