Battery Charging Control; Table 1-13 Time Required For Charges Of Main Battery; Table 1-14 Data Preservation Time - Toshiba Satellite U840 Maintenance Manual

Chapter 1 Hardware Overview

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 adaptor and
battery are connected to the computer.
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 1-13.

Table 1-13 Time required for charges of main battery

Power On Charge
Power Off Charge
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 1-14.
Condition
Standby
Hibernation
Battery
Pack
Approximately 1 month(shutdown mode,All type of battery pack
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Satellite U840 Maintenance Manual (960-Q08)
Condition

Table 1-14 Data preservation time

6 cell Approximately 3 days(sleep mode)
Charging Time
About 12 hours-
About 4 hours
preservation time
About 3 days
About 1 month