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

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 device at the places where the old adhesive was located, not directly onto the battery. Press the new battery firmly into place.

During reassembly apply new adhesive where necessary after cleaning the relevant areas with isopropyl alcohol (>90%).