Toshiba T-Series T4500, User Manual

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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
Time
Charging Time Power On 20 H
Power Off Doesn’t charge
Data preservation period (full charge) 8.0 H
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
Time
Charging Time Power On 24 H
Power Off 24 H
Data preservation period (full charge) 1 month