1 Hardware Overview 1.9 Batteries
1-28 PORTEGE M300 Maintenance Manual (960-504)
1.9.2 Battery Charging Control
Battery charging is controlled by a power supply microprocessor. The power supply
microprocessor controls power supply and detects a full charge when the AC adapter and
battery are connected to the computer.
θ Battery Charge
When the AC adapter is connected, normal charging is used while the system is turned on
and quick charge is used while the system is turned off. Refer to the following Table 1-12.
Table 1-12 Time required for charges of main battery
Condition Charging Time
4700mAh About 4.0 to 5.5 (hours)
Normal charge
(Power on) 8800mAh About 6.0 to 9.0 (hours)
4700mAh About 3.0 (hours)
Quick charge
(Power off) 8800mAh About 4.5 (hours)
Charge is stopped in the following cases.
1. The main battery is fully charged
2. The main battery is removed
3. Main battery or AC adapter voltage is abnormal
4. Charging current is abnormal
θ Data preservation time
When turning off the power in being charged fully, the preservation time is as
following Table 1-13.
Table 1-13 Data preservation time
Condition preservation time
4700mAh About 5 days
Standby mode 8800mAh About 9 days
4700mAh About 40 days
Power off 8800mAh About 80 days