Toshiba PORTEGE M400 - Manual (Page 41)

1.7 Batteries 1 Hardware Overview
PORTEGE M400 Maintenance Manual (960-541) [CONFIDENTIAL] 1-27
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
Time
Charging time AC adapter or main battery in use
(Power ON)
about 8 hours
Data preservation time (when fully charged) about 30 days