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1.9.2
Battery Charging Control
Battery charging is controlled by a power supply 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 adapter and battery are attached to the computer. The system charges
the battery using quick charge or trickle charge.
NOTE: When the temperature difference between the computer and the battery
pack is more than 10°C, a full charge may be detected even if the battery is not full
charged. Remove the battery pack for about five minutes to let the computer
and battery reach the same temperature. Then, reinstall the battery pack.
Quick Battery Charge
When the AC adapter is attached, there are two types of quick charge: quick charge 1
when the system is powered off and quick charge 2 when the system is powered on.
Quick charge 1
(power off)
Quick charge 2
(power on)
NOTES
1: The time required for quick charge 2 is affected by the amount of
2: Using quick charge 1, the system CPU automatically stops the
If the 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 output voltage is abnormal.
Trickle Battery Charge
When the main battery is fully charged and the AC adapter is attached, the micropro-
cessor automatically changes quick charge 1 or 2 to trickle charge.
1-18
Table 1-9 Time required for quick charges
Kind of battery
Nickel Metal Hydride
Nickel Metal Hydride
power the system is consuming. Use of the fluorescent lamp and
frequent disk access diverts power and lengthens charge time.
charge after two hours and twenty minutes regardless of the battery
condition.
Charging time
About 1 hour, 30 minutes
2 to 4 hours (typical: 3 hours)
T4700CS, T4700CT, T4800CT
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