Safe lock runs on batteries? Getting the warning beeps or blinking lights indicating batteries are low? Time to change those batteries? Before you do attempt to make the change, dig out those old instructions. Some steps can be very important. Skip a step and you may have a locked up safe. Often your instructions will say change the batteries with the safe door open. This step is important if your instructions outline it. This allows you to test the lock without risk of locking up the safe. Use fresh good quality batteries recommended by your manufacturer. And remember, when in doubt give Solid a call. (985)662-9999