When temperatures drop really low, the liquid inside the battery is affected, slowing the process that produces electrical current. Battery warmers are basically a wrap that you put around your battery and leave there during the winter months. They usually stick together on the en

EVs rely entirely on electricity to produce heat for their cabins, and early electric cars like the original Nissan Leaf and Mitsubishi i-MiEV used resistive heating for this process. (Some modern EVs like the Rivian R1T still do.) The process is fairly simple and works a lot like a space heater you might find in a home.