Toshiba Satellite U500 - Batteries; Battery Charging Control; Main Battery; Table 1-7 Battery Specifications

1 Hardware Overview
Satellite/Satellite Pro U500D/505D/507D/PORTEGE M900 Maintenance Manual [CONFIDENTIAL] 1-23
1.8 Batteries
The computer has two types of batteries as follows:
 Main battery pack
 RTC battery
The battery specifications are listed in Table 1-7.
Table 1-7 Battery specifications
Battery name Material Output voltage Capacity
Main battery (6 cell) Lithium-Ion 10.8V 4000 mAh
Main battery(12cell) Lithium-Ion 10.8V 9000 mAh
RTC battery Lithium 3.0 V 18 mAh
1.8.1 Main Battery
The removable main battery pack is the computer’s main power source when the AC adaptor
is not attached. The main battery maintains the state of the computer when the computer
enters into resume mode.
1.8.2 Battery Charging Control
Battery charging is controlled by an Embedded Controller (EC). The EC controls whether the
charge is on or off and detects a full charge when the AC adaptor and battery are attached to
the computer. The system charges the battery.
Battery Charge
When the AC adaptor is attached, there are two types of charge: When the system is powered
off and when the system is powered on. Table 1-8 lists the charging time required for charges.
Table 1-8 Time required for charges
Battery type Power on (hours) Power off (hours)
battery pack (6cell,12cell) 4-10 hours 4 hours max
RTC Battery About 24 hours About 24 hours