1 Hardware Overview
dynabook PORTEGE A30-E/TECRA A30-G,-J/dynabook S Series Maintenance Manual (960-931) [CONFIDENTIAL] 1-23
1.7.2 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.
Battery Charge
When the AC adaptor is attached, the battery is charged. There are two types of charge
depending on the power conditions: power on and power off. The following table lists the
charging time required for charges.
Table 1-7 Time required for charges
Battery type Power on (hours) Power off (hours)
Battery pack (2Cell, 21Wh) About 2.5 About 2.5 to 10.0
Battery pack (4Cell, 42Wh) About 2.5 About 2.5 to 10.0
If any of the following occurs, the battery charge process stops.
1. The battery becomes fully charged.
2. The AC adaptor or battery is removed.
3. Output voltage from main battery or AC adapter is abnormal.
4. Charging current is abnormal.
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