Something I now have to consider is how to keep the batteries warm in wintertime. Fortunately, I don’t have to worry about snow or ice, but it does get close to freezing. So when I redo the pack, I will install battery warming pads – these will be plugged in when the car is plugged in – they have built-in thermostats, so it is set-and-forget.
Example: https://www.amazon.com/dp/B000I8VL16/ref=wl_it_dp_o_pC_nS_ttl?_encoding=UTF8&colid=ECZS9XXRJF00&coliid=I1DAV5PWDDSP7T
That and some insulation around the side should help tremendously.
