Toshiba Satellite A660-BT3G25X Maintenance Manual - Page 33

1.6 Batteries The computer has the following two types of batteries: Main Battery Pack Real Time Clock (RTC) Battery 1 Hardware Overview 1.6.1 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. 1.6.2 Battery Charging Control Battery charging is controlled by EC KB926. When the AC adapter and battery pack are attached to the computer, the EC KB926 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 1-4 Quick/Normal Charging Time State Off-State Charge On-State Charge 3, 6 or 12 Cell 3, 6 or 12 Cell Charge Time 4 hours max 12 hours max Satellite A660/Pro A660 Maintenance Manual 1-16