Remove the battery.

Don‘t reuse the battery if it has been deformed or damaged, as doing so is a potential safety hazard. Replace it with a new battery.

Secure a new battery with pre-cut adhesive or double-sided adhesive tape. In order to position it correctly, apply the new adhesive into the battery well at the places where the old adhesive was located, not directly onto the battery itself. Peel back any adhesive liners and press the new battery firmly into place.

If you're reusing your old battery, you can reuse the existing adhesive to secure the battery during reassembly.