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1 Hardware Overview
Satellite M500/M505/M507 Maintenance Manual [CONFIDENTIAL] 1-23
1.8.2 Battery Charging Control
Battery charging is controlled by an embedded controller (EC). The EC 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 1-7 lists the charging time required for charges.
Table 1-7 Time required for charges
Battery type Power on (hours) Power off (hours)
1st battery pack (6cell,12cell) 4-10 hours 4 hours max
RTC Battery About 24 hours About 24 hours
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.
1.8.3 RTC battery
The R
TC battery provides power to keep the current date, time and other setup information
in memory while the computer is turned off. Table 1-8 lists the data preservation period of
the RTC battery.