A year later and at -43C the LiPo finally died see:Solar Electron on lithium at -43C
So now I’m finally getting around to the responsible thing and turning off charging at low temperatures. However, since the unit on a LiPo that failed at -43C is inacessable 'till late spring, I still don’t know if it was failure of the LiPo or of the electron. I’m assuming it was the LiPo.
And questions remain: will not charging at low temperature save the LiPo or would -43C kill a LiPo even if it wasn’t charging? and where the heck do I find -40 to -50C for test my new setup 