Older and new electric car …
Older and new electric car batteries require a battery warmer function as well as battery tenderer for 12 v lead acid battery. My usa made nissan leaf does not have a battery warmer and the previous owner installed a 12 v battery tendorer before I purchased. Just like gasoline cars require block heaters Canadian auto dealers don't seem to mention block heaters are optional and you have to order them at purchase or pay more to do later. I can't even find out how to add battery warmer to my Leaf as a Canadian Nissan dealer told me to call the states but Nissan USA had no idea of the part number for a Canadian Leaf. Even though they probably have the same issue in Alaska and Northewn States. Warm batteries are likely essential to electric cars until the chemistry can be updated.
By the way, AMA has level 2 charge batteries they can throw into their service trucks to boost the charge on your electric car. They keep them in a Edmonton shop to stay warm. Contact them to see how they work. Boosting the 12 volt lead acid. Battery only helps the electronics of your vehicle.