Toshiba Satellite U400 - 3 RTC Battery; RTC Battery; Table 1-14 Time Required for Charges of RTC Battery

Chapter 1 Hardware Overview
Satellite U400/Satellite Pro U400/PORTEGE M800  Maintenance Manual 25
1.8.3 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 Time required for charges of RTC battery and data preservation time.
Table 1-14 Time required for charges of RTC battery
Condition Time
Power ON (Lights Power LED) About 24 hours
Data preservation tome (Full-charged) About a month