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1.12 Batteries 1 Hardware Overview
1.12.2 Battery Charging Control
Battery charging is controlled by a power supply microprocessor. The microprocessor
controls whether the charge is on or off and detects a full charge when the AC adaptor and
battery are attached to the computer. The system charges the battery using quick charge.
Quick Battery Charge
When the AC adaptor 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 1-11
lists the charging time required for quick charges.
Table 1-11 Time required for quick charges
Status Charging time
12 cell About 4.5 hours
Quick charge 1
(Power off)
6 cell About 2.5 hours
12 cell About 10.5 to 21.5 hours Quick charge 2
(Power on)
6 cell About 5.0 to 11.0 hours
NOTE: 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.
If any of the following occurs, the battery quick charge process stops.
1. The battery becomes fully charged.
2. The AC adaptor or battery is removed.
3. The battery or output voltage is abnormal.
Detection of full charge
A full charge is detected only when the battery is charging at quick charge. A full charge is
detected under any of the following conditions:
1. The current in the battery charging circuit drops under the predetermined limit.
2. The charging time exceeds the fixed limit.
TECRA M2 Maintenance Manual (960-468) 1-33