Lift up the battery using the plastic opening tool.

The battery is glued to the bottom, removing it will not damage the device.

Remove the battery using your hand.

Do not reuse the battery after it has been removed, as doing so is a potential safety hazard. Replace it with a new battery.

To install a new battery:

Remove any remaining adhesive from the phone, and clean the glued areas with isopropyl alcohol and a lint-free cloth.

Secure the new battery with pre-cut adhesive or double-sided adhesive tape. In order to position it correctly, apply the new adhesive into the phone, not directly onto the battery.

Press the battery firmly into place for 5-10 seconds.