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You should charge the battery regularly to ensure that your phone is always ready for use. The battery can be charged even if it's not completely flat. You can use your phone while the battery is charging. Follow these instructions to charge the battery.
Connect the charger to your phone
Connect the charger to the socket and to a wall socket.
When the battery charging icon is displayed, charging is in progress.
When the battery is fully charged, you can remove the charger from the wall socket and your phone.
When your phone is turned on, you can always see the battery power level. The bigger the coloured section of the battery icon, the more power.