1.9 Batteries 1 Hardware Overview
PORTEGE M300 Maintenance Manual (960-504) 1-29
1.9.3 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 1-14 lists the charging time and data
preservation period of the RTC battery.
Table 1-14 RTC battery charging time
Condition Time
Power ON (Lights Power LED) About 8 hours
Data preservation tome (Full-charged) About 30 days