Originally Posted by
EricW
If you're hammering a battery with a 40-amp discharge/charge cycle to heat it up and drop the impedance to get better performance you're probably not overly concerned with the life of your batteries. I believe there's also a rule that your battery has to be within a few degrees of the ambient temperature of where you are racing. I'd also prefer someone use an iCharger to cycle their batteries than sticking a battery in a toaster oven.
Note: Most of the crazy charge/discharge and heating of batteries is for stock racing. If you're racing mod, then just get a decent charger that will charge your batteries. Although, an iCharger is nice to have as it does a good job of showing you the stats of your batteries and helps with maintaining the health of your battery.
Surface temp of the pack?
Honestly surprised racers don't put small heating strips between cells to warm them internally. You could hide it pretty well, and its only cheating if you get caught.