 The battery symbol is shown reducing from full to empty. At the low battery symbol, pager screen time and alert tone time are reduced and the pager will beep every hour. At the lowest power, the pager closes down and displays Replace Battery. To replace the battery, you will need a 10 or 5 cent coin to unscrew the battery hatch captive screw. Once loosened, the hatch can be slid to the side and lifted off. Note the AA battery polarities when replacing, do not reverse as this will wipe stored messages.