Toshiba PORTEGE M400 Maintenance Manual page 135

1.7 Batteries
1.7.3 RTC Battery
The RTC battery provides the power supply to maintain the date, time, and other system
information in memory. Table 1-14 lists the battery charging time and data preservation
times.
Table 1-14 RTC battery charging/data preservation time
Charging time
Data preservation time (when fully charged)
PORTEGE M400 Maintenance Manual (960-541)
AC adapter or main battery in use
(Power ON)
1 Hardware Overview
Time
about 8 hours
about 30 days
[CONFIDENTIAL] 1-27