Nokia 5230 User Manual page 14

14 Get started
3 When the device indicates a full charge, disconnect the charger from the device,
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 appears on the display or before any calls can be
made.
Tip: Disconnect the charger from the wall outlet when the charger is not in use. A
charger that is connected to the outlet consumes power even when it is not connected
to the device.