Toshiba T2100 Series Maintenance Manual page 21

1.10.2 Battery Charging Control
Battery charging is controlled by a microprocessor that is mounted on the power supply. The
microprocessor controls whether the charge is on or off and detects a full charge when the AC
power cord and main battery are attached to the computer.
The system charges the battery using quick charge when the system is powered off, or trickle
charge when the system is powered on. The trickle charge state maintains the full charge of
the battery. Table 1-11 lists the time required for charging the main battery.
If one of the following occurs, the battery quick-charge process stops.
1. The battery becomes fully charged.
2. The battery is removed.
3. The battery or AC output voltage is abnormal.
4. The charge current is abnormal.
When the main battery is fully charged and the AC power cord is attached, the power supply
microprocessor automatically changes quick charge to trickle charge.
T2100 Series
Table 1-11 Time required for charges
Power
Power off
Power on
Charging time
About 2.5 hours
Trickle charge
1-21