Backup Battery; Rtc Battery - Toshiba T4500 User Manual

3. The battery or output voltage is abnormal.
Trickle Battery Charge
When the main battery is fully charged and the AC adapter is attached, the microprocessor auto-
matically 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 de-
tected 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 and Hard RAM. The power source used to
back up the AutoResume or Hard-RAM 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 1-11 shows the charging time and data preservation period of the backup battery.
Table 1-11 Backup Battery Charging/Data Preservation Time
Charging Time
Data preservation period (full charge)
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 1-12 shows the charging time and data preserva-
tion period of the RTC battery.
Table 1-12 RTC Battery Charging/Data Preservation Time
Charging Time
Data preservation period (full charge)
Power On
Power Off Doesn't charge
Power On
Power Off
1 month
Time
20 H
8.0 H
Time
24 H
24 H
1-23