9V Battery

The  is an item used to power electrical devices in DayZ Standalone. The battery can be attached and detached. When in use its charge will gradually decrease until it becomes useless. The physical condition of the battery does not affect its charge*. The battery can be attached to powered items by clicking and dragging it over the items. To detach the battery, click and drag it back into your inventory or into the vicinity window.

Items that Require Batteries
A pristine, fully-charged has 50 "energy" to use.

Trivia

 * Up until 0.57, players spawned with a Flashlight that also included a . That combination was instead replaced with a Chemlight, and then in 0.58 replaced again with a Road Flare. Currently a Chemlight is the spawning item again.