The battery has completely discharged and been left unattended for a
long time.
In such cases you should follow the steps as detailed below:
1. Fully discharge the battery when powered on until the system
automatically turns the tablet off.
2. Connect the AC adaptor to the docking interface of the tablet, and to a
wall outlet that is supplying power.
3. Charge the battery until the battery meter reaches its full capacity.
Repeat these steps two or three times until the battery recovers normal
capacity.
TOSHIBA AT330
User's Manual 3-13