Follow these preparation steps before using adhesive remover.

Apply a few drops of adhesive remover or high-concentration (90% or higher) isopropyl alcohol into the gap at the left edge of the battery.

Lift the bottom of your phone up to tilt it in the direction of the rear facing camera to let the adhesive remover spread out underneath the battery.

Let the adhesive remover penetrate the battery adhesive for at least 1 minute.