Nokia X7-00 - Manual (Page 14)

3 When the phone indicates a full charge, disconnect the charger from the phone,
then from the wall outlet.
You do not need to charge the battery for a specific length of time, and you can use
the device while it is charging.
If the battery is completely discharged, it may take several minutes before the
charging indicator is displayed or before any calls can be made.
If the battery has not been used for a long time, to begin charging, you may need to
connect the charger, then disconnect and reconnect it.
Tip: You can also use a compatible USB charger to charge your battery.
Charge the battery over USB
Battery low, but you don't have a charger with you? You can use a compatible USB
cable to connect to a compatible device, such as a computer.
To avoid breaking the charger connector, be careful when connecting or
disconnecting the charger cable.
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