Follow this step if you couldn't loosen the battery using the battery release strip.

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

Don't apply too much alcohol, or you'll loosen the NFC antenna and charging coil underneath the battery.

Wait about one minute for the alcohol solution to weaken the adhesive.

Use the flat end of a spudger or an opening pick to gently lift the top edge of the battery until you can grab it with your fingers.

Don't use excessive force on the battery. Slow, consistent pressure is all that's required to free it from the frame.

Take care not to puncture or bend the battery with your tool—a punctured or bent battery may leak dangerous chemicals or cause a fire.