The Oculus controllers use AA batteries, and each controller requires one AA battery. You can use either disposable (alkaline) or rechargeable options as you see fit. If youre using rechargeable batteries, bear in mind that they tend not to last as long in one go, and youll need a dedicated charger to top them up. According to a Reddit thread, AA batteries will work fine and last for multiple weeks, if not months, and the Quest 2 controllers are power-efficient. If youre using disposable batteries, its usually best to wait until your batteries are nearly drained to change them. If youre using rechargeable batteries, you can purchase rechargeable battery and cover sets that are compatible with the Oculus Quest 2 controllers.