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1 Hardware Overview 1.8 Batteries
1-32 [CONFIDENTIAL] Satellite R20/TECRA M7 Maintenance Manual (960-572)
1.8.2 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.
Quick 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 or in standby mode.
Table 1-12 lists the main battery charging time.
Table 1-12 Time required for charges of main battery
Charging Time
Battery Capacity Normal charge Quick charge
Main (4700mAh) about 3.0 to 13.0 about 3.0
Second (4000mAh) about 3.0 to 9.5 about 3.0
Quick battery 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.
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
Standby mode About 5 days
Main (4700mAh)
Boot mode About 60 days
Standby mode About 5 days
Second (4000mAh)
Boot mode About 50 days