A battery back-up is provided to allow the Power Pro to remember Cab assignments,
consists, etc. when the power is turned off. The battery should be replaced with CR-
2032 3 VOLT LITHIUM in about 5 years. The battery should be replaced with the power on if you wish to retain all system settings. We put a scrap of notepaper over the lower circuit board(s) to prevent shorts if we accidentally drop the battery while changing it.