Battery

Batteries are material items that were added in update v0.01 to The Forest.

Gameplay
Batteries are used to recharge the flashlight and flashlight upgraded weapons. They currently have no other use in the game.

Locations
They can be found in the cave or inside of suitcases. When you collect flashlights, you will get a set of batteries with it. It is difficult to locate batteries outside of caves apart from opening suitcases.

Crafting
Keep in mind, when using weapons with the flashlight upgrade, the flashlight will run non-stop and cannot be switched off. This can consume a lot of batteries.

Trivia
The fictional brand name of these batteries are "batterytech" with the slogan "HYPER CHARGE TECHNOLOGY SYSTEM", and the item models a pack of 4 AA batteries, but the inventory icon appears to be that of a C battery, which is typically used in heavy duty flashlights.