Alkaline Battery 9V is an item in DayZ Standalone (DZSA).
You can use the 9V Battery to power your Flashlight
This battery also powers the Defibrillator and Headtorch
How to use
Open your inventory and drag the Battery to your flashlight, and an option should appear to attach the battery
Description
BebulCell alkaline 9V battery. Both electrical contacts on one side of the battery, the positive one being the smaller one.