Rechargeable AA batteries, USB-C port for charging, LED indication

Good for VR controllers or anny other electronic (in Quest 3 controller last for approximately 2 weeks of 6-8h gaming sessions per one charge)

If you’re device can measure battery level it won’t work properly because this is lithium battery with voltage converter inside which steps down voltage to 1,5V (voltage of classic AA battery) and holds on that level until completely dry (just keep that in mind so you won’t need to change them during hard gaming session 😁)