Toshiba T4900CT - Page 17

T4900CT
1-17
❏ Trickle Battery Charge
When the main battery is fully charged and the AC adapter is attached, the micropro-
cessor automatically changes quick charge 1 or 2 to trickle charge.
❏ 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.
1.8.3 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 power is
turned on and off. Table 1-8 shows the charging time and data preservation period of the
backup battery.
Table 1-8 Backup battery charging/data preservation time
Time
Charging Time Power On 3 H
Power Off 3 H
Data preservation period (full charge) 3 H
1.8.4 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 1-9 shows the charging time and data
preservation period of the RTC battery.
Table 1-9 RTC battery charging/data preservation time
Time
Charging Time Power On 24 H
Power Off 24 H
Data preservation period (full charge) 1 month