If the battery remains stuck to the rear case, prepare an iOpener or use a hair dryer to heat the rear case directly behind the battery.

Then, use a plastic opening tool to gently lift the battery.

Overheating the iPhone may ignite the battery.

Alternatively, a piece of dental floss may be used to separate the battery from the rear case. A stronger alternative to dental floss is an unwound guitar string, such as a 0.009 E string from a 12-string set.

Thread the floss or string underneath one end of the battery and pull side to side in a sawing motion to separate the adhesive.