1 Hardware Overview
1-24[CONFIDENTIAL]Satellite/Satellite Pro U500D/505D/507D/PORTEGE M900 Maintenance Manual
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 RTC battery provides power to keep the current date, time and other setup information
in memory while the computer is turned off.
Table 1-9 lists the data preservation period of the RTC battery.
Table 1-9 RTC battery charging/data preservation time
Status Time
Data preservation period (full charge)
90 days
