Apply a heated iOpener to the screen for at least two minutes to loosen the adhesive beneath the battery.

The adhesive beneath the battery is very strong. You might need to repeat this process during the removal procedure several times. If heat does not work you can apply isopropyl alcohol (>90%) to the corners of the battery and let it penetrate the adhesive for several minutes before continuing.

The flex cables underneath the battery are laid out as shown in the image. Try to avoid prying close to the marked areas to prevent damaging the cables.

Display flex cable

Interconnect flex cable