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. It should be slightly too hot to touch comfortably.

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

Overheating the iPhone may ignite the battery.

Alternatively, if the battery remains stuck to the rear case, flip the iPhone back over and thread a piece of dental floss or strong string behind the battery. Then, slowly pull back and forth in a sawing motion to separate the adhesive.

A stronger alternative to floss is an unwound guitar string, such as a 0.009 E string from a 12-string set.