Repeat the last step with an opening card to slice through the remaining adhesive under the right side of the battery.

Remove the battery.

Do not reuse the battery after it has been removed. The stress of removal can cause hidden damage to the battery cell, creating 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 entire area under the battery with isopropyl alcohol. If there's any alcohol solution remaining in the phone, carefully wipe it off with a lint-free cloth or allow it to air dry before installing your new battery.

Apply a few new strips of pre-cut adhesive or Tesa tape.

If you are attaching the battery with a custom-cut adhesive, follow this guide.

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