Insert a plastic opening pick between the case and the battery.

Be careful to keep the pick as flat as possible to avoid bending the battery, which may damage it and cause it to release dangerous chemicals.

Push the pick further in to separate the battery from the phone.

If the battery is too strongly adhered for the opening pick, place a warm iOpener over the battery to loosen the adhesive.

Alternatively, apply some isopropyl alcohol under each corner of the battery and allow it to penetrate for several minutes to help weaken the adhesive.

Do not pry against the motherboard or you may damage the phone.