Toshiba T4700CS Maintenance Manual page 19

Detection of full charge
A full charge is detected only when the battery is charging at quick charge. A full
charge is detected under any of the following conditions:
1. A battery voltage fall is detected.
2. The charging time exceeds the fixed limit.
3. The thermal rise (+DT) exceeds the fixed limit.
4. The battery's temperature is over 60°C.
1.9.3 Backup Battery
The backup battery maintains data for AutoResume. The power source used to back-up the
AutoResume data is determined according to the following priority:
AC adapter > Main battery > Backup battery
The backup battery is charged by the main battery or AC adapter when the system is powered
on. Table 1-10 shows the charging time and data preservation period of the backup battery.
Table 1-10 Backup battery charging/data preservation time
1.9.4 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. Table 1-11 shows the charging time and data
preservation period of the RTC battery.
Table 1-11 RTC battery charging/data preservation time
Charging Time
Data preservation period (full charge)
T4700CS, T4700CT, T4800CT
Charging Time Power On
Power Off
Data preservation period (full charge)
Power On
Power Off
Time
20 H
75 H
8.0 H
Time
24 H
24 H
1 month
1-19