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1 Hardware Overview
PORTEGE M780 Maintenance Manual (960-809) [CONFIDENTIAL] 1-31
Data preservation time
When turning off the power in being charged fully, the preservation time is as
following Table 1-9.
Table 1-9 Data preservation time
Condition preservation time
Sleep Mode
About 4 days Battery(51Wh, 6 cell)
Boot Mode
About 40 days Battery(51Wh, 6 cell)
Sleep Mode
About 3 days (44Wh, 6 cell)
Boot Mode
About 35 days(44Wh, 6 cell)
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 1-10 lists the charging time and data
preservation period of the RTC battery.
Table 1-10 RTC battery charging/data preservation time
Status Time
Charging Time (power on) 8 hours
Data preservation period (full charge) 30 days