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1.6 Batteries 1 Hardware Overview
Satellite M40X Series Maintenance Manual [CONFIDENTIAL] 1-19
1.6.2 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. The table below lists the charging time and data
preservation period of the RTC battery. The RTC battery is charged by the adaptor or main
battery, while the computer is powered on.
Status Time
Charging Time (power on) About 24 hours
Data preservation period (full charge) 1 month