For key fob w/o comfort access is the key battery being charged when you plug into the car? Has anyone ever need to replace the battery if it's being driven daily? If the keyfob battery dies, and you open the car w/the metal key, can you still start the car by plugging in the keyfob? What about the key for Comfort Access, is there a way to charge they key's battery? Similiarly if the Comfort Access key's battery dies is there a way to start the car?