If your battery is stuck and an appropriate liquid solvent is not available, prepare an iOpener or use a hair dryer to heat the rear case directly behind the battery.

Heat the iPhone until the rear case is slightly too hot to comfortably touch, but no more.

Flip the iPhone back over and thread a strong piece of string (such as dental floss) underneath the battery.

Wear gloves to protect your fingers, or wrap each end of the string around a tool.

Pull the string from side to side in a sawing motion to separate the adhesive. This can take some time since the adhesive is slow to deform, but with patience it will come free. Do not deform or damage the battery.

Start from the top or bottom edge of the battery, and pull toward the middle. Don't pull the string through the middle third of the battery, or you may damage the ribbon cables or the wireless charging coil directly underneath.

If you choose to use pry tools to lift the battery out of the iPhone, use extreme caution or you may damage the ribbon cables or the wireless charging coil directly underneath the battery.