Our '97 Chrysler Cirrus needs the remote batteries changed about every 3 or 4 years or when it starts acting intermittently. They use watch style batteries.53LEDSLED said:i have a 99 f250 and the key less remote doesn't work all the time. its sort of a hit or miss. i know that it works after i use the key to unlock the door and also after i turn the engine off. i haven't tried to replace to batteries yet.