Slide a nylon spudger under the battery.

Gently pry the battery from the case, releasing the glue holding it in place.

If the battery will not come loose, applying force with the nylon spudger at different points of entry may help to free it. Using a hair dryer or heat gun may be helpful to further loosen the glue.

When dislodging the battery, be careful not to puncture the battery or battery wrapping to avoid further damaging the device or harming yourself.

When working with electronics, it's important to choose a tool that's ESD-safe to avoid accidental damage to the device.