Toshiba Satellite U900, Maintenance Manual

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1.4 Batteries 1 Hardware Overview
1-13 [CONFIDENTIAL] Metis 10F/10FG Maintenance Manual
1.4 Batteries
The computer has the following two types of batteries:

Main Battery Pack

Real Time Clock (RTC) Battery
1.4.1 Main Battery
The main battery pack serves as the computer's main power source when the AC adapter is not
attached. The main battery maintains the state of the computer when the AC adapter is detached.
1.4.2 Battery Charging Control
Battery charging is controlled by KB9102. When the AC adapter and battery pack are attached to
the computer, the KB9102 controls the charge on/off state and detects a full charge.

Battery Charge
When the AC adapter is attached, the battery is charged by off-state charge when the system
is powered off or by on-state charge when it is powered on.
Table 1-3 Quick/Normal Charging Time
State Charge Time
Off-State Charge Battery pack (3000mAh, 4 cell) About 3 hours max
On-State Charge Battery pack (3000mAh, 4 cell) About 12 hours max