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It may be necessary to change the battery if it's faulty or remove and insert it again if your phone isn't responding.
1. Remove back cover
Turn the back of your phone towards you. Take hold of the back cover and remove it.
2. Remove the battery
Remove the battery from your phone.
3. Insert battery
Place the battery in your phone (top 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.