Toshiba Portege R500 Maintenance Manual - Page 37

1.10 Batteries 1 Hardware Overview 1.10.2 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. Battery Charge When the AC adaptor is attached, there are two types of charge: When the system is powered off and when the system is powered on. Table 1-8 lists the charging time required for charges. Table 1-8 Time required for charges Battery type Battery(2,900 mAh) Battery(5,800 mAh) Power on (hours) About 5.0 to 7.5 About 6.5 to 15.0 Power off (hours) About 5.0 About 5.0 NOTE: The time required when the system is powered on 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 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 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. PORTEGE R500 Maintenance Manual (960-634) [CONFIDENTIAL] 1-23