Remove the battery and its film.

During reassembly:

If you're reusing the original battery:

Never reuse a damaged or deformed battery—it's a potential safety hazard. If the battery is bent, deformed, or damaged in any way, replace it with a new battery.

If the plastic battery film was damaged during removal, carefully remove it—be very cautious not to bend or damage the battery in any way. Apply new film to the battery, making sure the tabs go on the left edge.

Remove the two large plastic liners from the outer edges of the battery recess to expose the adhesive.

Firmly press the battery into its recess so the cable is on the top edge.