Each Honeywell (formerly Brinks) safe comes with an emergency key that overrides the combination and entry key. To use the emergency key, insert it and turn it to the left.
you'll want to replace them. You can refer to your Honeywell safe digital manual (available online) in order to find out what battery type and size your safe requires. After you've removed the old batteries and inserted new ones, you'll need to reset the safe's combination....