Toshiba T1900 Series - Battery Charging Control

1.9.2 Battery Charging Control
Battery charging is controlled by a microprocessor that is mounted on the power supply. This
microprocessor controls whether the charge is on
or off and detects a full charge when the AC
adapter and battery are attached to the computer. The system charges the battery using quick
charge
or trickle charge.
Q Quick Battery Charge
When the AC adapter is attached, there are two types of charge: quick charge when the
system is powered off, and trickle charge when the system is powered on.
Table 1-9 Time Required/or Charges a/the Main Battery
Charge Kind of Battery Charging Tlma
Quick charge
(power off)
Nickel Metal Hydride About 2 hours
Trickle charge
(power on)
Nickel
Metal Hydride About 48 hours
If one of the following occurs, the battery quick-charge process stops.
1. The battery becomes fully charged
2. The AC adapter or battery is removed.
3. The battery
or AC adapter output voltage is abnormal.
Q Trickle Battery Charge
When the main battery is fully charged and the AC adapter is attached, the power supply
microprocessor automatically changes quick charge 1
or 2 to trickle charge.
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