T4900CT
1.8.2 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 fully 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.
Table 1-7 Time required for quick charges
Kind of battery Charging time
Quick charge 1 Nickel Metal Hydride About 1 hour, 30 minutes
(power off)
Quick charge 2 Nickel Metal Hydride 4 to 6 hours (typical: 5 hours)
(power on)
NOTES 1: The time required for quick charge 2 is affected by the amount of
power the system is consuming. Use of the fluorescent lamp and
frequent disk access diverts power and lengthens the charge time.
2: Using quick charge 1, the power supply microprocessor automatically
stops the charge after two hours and twenty minutes regardless of the
condition of the battery.
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 output voltage is abnormal.
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