You need to manually set the low voltage disconnect so that your batteries bms does not go into safety mode. then you won't have the first problem you stated.

You need to manually set the low voltage disconnect so that your batteries bms does not go into safety mode. then you won't have the first problem you stated. What you need is more insulation. I've tested that battery and the internal heaters work great, but you should put it somewhere where the heat that is created stays in the battery.