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You should charge the battery regularly to ensure that your router is always ready for use. The battery can be charged even if it's not completely flat. You can use your router while the battery is charging.
1. Connect the charger to your router
Connect the charger to the socket at the bottom of your router and to a wall socket.
2. End charging
When the battery is fully charged, you can remove the charger from the wall socket and your router.