Thanx again for the informational replies fellas.

And what a couple of great links for battery info of all types FB, you should post them in the Favorite Links thread.
oh & no doubt the results of destroying the lipos might have been vastly different if I hadn't gotten distracted with a ringing phone & forgotten the packs outside on the cold step, which is why I made mention of it & then saw not much excitement.
-10C can be a shocker when the temp might have been +20C the day before, but really it's quite mild compared to -40C = -40F that we do see sometimes during the winter.

It hasn't gotten remotely close to that this yr yet.. usely January hi-lights.