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It may be necessary to change the battery if it's faulty or remove and insert it again if your router isn't responding.
1. Remove back cover
Turn the back of your router towards you. Take hold of the back cover and remove it.
2. Remove the battery
Take hold of the left side of the battery and remove it.
3. Insert battery
Place the battery in your router (right side first), matching the battery contacts with the router contacts, and press the battery into place.
4. Replace back cover
Place the back cover on your router and press it into place.