Yes, lipos do not like the cold. Stick them in your pockets of place them under your sac (HAHAHA) to get them to warm up. The 30c enerland cells were the worst, I had a 4500mah 30c pack that would barely move the truck till it got warm, but then it was a best. In fact it worked best at around 130f... Kinda hot. I have noticed the zippy packs do not need to be as warm to run well.