Pico Neo 3 controllers take two AA batteries each. Push in the lower half of the controller and slide down to open the battery compartment. Change the AA batteries and replace the cover.

Pico controllers take two AAA batteries. To change the battery, pull down on the battery cover to remove the cover and replace the batteries. You may check the precise battery level percentage during training by holding the controller in front of the headset.

The Oculus Go controller takes one AA battery. To change the battery, pull down on the lower half of the controller to remove the end cap and replace the battery. The battery should be installed to match the molded diagram on the inside of the battery compartment (positive side facing down toward the tether.)