The Remote Keyless Entry (RKE) transmitter case snaps open and shut for battery access. To replace the RKE transmitter batteries:Using a thin coin, gently pry at the notch in the center seam of the RKE transmitter case halves near the key ring until the two halves unsnap.Lift the back half of the transmitter case off of the RKE transmitter.Remove the two batteries from the RKE transmitter.Replace the two batteries with new Panasonic 2016, or equivalent. Be certain that the batteries are installed with their polarity correctly oriented.Align the two RKE transmitter case halves with each other, and squeeze them firmly and evenly together until they snap back into place.