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.

Overheating the iPhone may ignite the battery.

Don't try to forcefully lever the battery out. Never deform or puncture the battery with your pry tool.

Do not pry against the logic board or you may damage the phone.

Avoid prying at the top left near the volume controls, or you may damage the volume button ribbon cable.

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 behind the upper battery corners, bring the ends together, wrap them around a folded cloth, and pull evenly.