LG U8120 User Manual page 17

Getting Started
If the backlight of sub-display is red when you connect charger:
The battery is fully discharged and it will take sometime(under 30 minutes) to charge the battery to minimum operating
level. When the red light is on, the handset can not be powered on. The red light will be turned off if the battery is
charged to minimum operating level.
Warning
You can make video call with charger connected.
But if the battery capacity is under 10% the battery can be discharged when you use video call even though the charger is
connected.
To use the charger provided with your phone:
1. With the battery in position on the phone, connect the lead from the charger to the bottom of the phone. Check that
the arrow on the lead connector is facing towards the front of the phone.
2. Connect the charger to a standard AC wall outlet. Only use the charger that comes included with the package.
User Guide l l Getting Started
Warning
Do not force the connector as this may damage the phone
and/or the charger.