Toshiba AT10-A - Manual (Page 26)

When the battery is completely discharged the tablet cannot be turned
on immediately. You should leave the AC adaptor connected for a few
minutes and the battery should begin charging. A battery meter icon (
) will appear indicating the charging status.
The indicator may show a rapid decrease in battery operating time when
you try to charge a battery under the following conditions:
The battery has not been used for a long time.
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 Micro USB port on 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.
User's Manual 3-13