1. Remove back cover
Turn the back of your phone towards you. Turn the back cover catch anticlockwise.
Take hold of the back cover and remove it.
2. Remove the battery
Take hold of the top of the battery and remove it.
3. Insert battery
Place the battery in your phone (bottom first), matching the battery contacts with the phone contacts, and press the battery into place.
4. Replace back cover
Place the back cover on your phone and press it into place.
Turn the back cover catch clockwise.