Nokia 701 User Manual page 13

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You do not need to charge the battery for a specific length of time, and you can use the
phone 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.
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 your phone to a compatible device, such as a computer.
You can use USB charging when a wall outlet is not available. Data can be transferred
while charging the device. The efficiency of USB charging power varies significantly, and
it may take a long time for charging to start and the device to start functioning.
You can use your phone while it's charging.
To avoid breaking the charger connector, be careful when connecting or disconnecting
the charger cable.