membership.
6.9 Built-in Battery
When the unit is charging, the red LED indicator at the back lights up.
The indicator turns off after the battery is fully charged. The battery
will be fully charged within 3 hours. However, charging time may be
longer if the unit is operating and charging at the same time.
If you want to change the power supply from power adaptor to
built-in battery, or vice verse, during the unit is running, switch off the
unit first. Otherwise, the system may freeze.