To charge the battery, insert the mobile telephone into the charging shell with the keypad facing forwards. 

Note:  Only use the approved C39280-Z4-C373 power supply unit to operate the charging shell.

The charging status is indicated by the charge status display. This flashes during charging: 

Note:    Initial charging: charge the battery for at least 16 hours, regardless of the charging status icon. Without replacing it in the charging shell, use the mobile telephone until the "battery low" beep is heard. This action aligns the charge status display with the battery operating times. To achieve full operating and charging times (see page 15), let the mobile telephone discharge a number of times without replacing it in the charging shell until the battery low beep sounds. For future charging: you can place your mobile telephone in the charging shell each time it is used. Charging is electronically controlled which ensures that the battery is charged optimally.