Ironically, any gadget that Acu is listing drains the batteries whiiiiiiich... ...are the only source of power in an electric car. Think about this for a minute. A petrol powered car will recycle engine heat to get the temperature up in the cabin in the winter. If you live in a cold area, be prepared to see your electric car's range decrease substantially when the temperature drops... as your batteries are being used to heat your ass instead of taking you somewhere. Isn't that a valid concern?