Chapter 1 Hardware Overview
Satellite L600D/L640D/L645D, Satellite Pro L600D/Pro L640D/Pro L645D Maintenance Manual (960-Q08)
1.7.3 RTC Battery
The RTC battery provides the power supply to maintain the date, time, and other system
information in memory.
Table 1-7-4 lists the Time required for charges of RTC battery and data retaining time.
Condition Time
Charging time About 24 hours
Data retaining time About 30days
Table 1-7-4 Time required for charges of RTC battery