Toshiba Satellite C855D - Batteries; Battery Charging Control; Main Battery; Table 1-6 Battery Specifications

1 Hardware Overview 1.9 Batteries
22 Satellite/Satellite Pro/C850D/C855D/L850D/L855D Maintenance Manual
1.9 Batteries
The computer has the following 2 types of battery:
 Main Battery Pack
 Real Time Clock (RTC) Battery
Table 1-3 lists the specifications of these batteries.
Table 1-6 Battery Specifications
Battery Type Material Output voltage Capacity
Main Battery Pack
3 Cell Lithium Ion 10.8 V 2200 mAh
6 Cell Lithium Ion 10.8 V
4400 mAh /
6000mAh
RTC Battery Lithium Ion 3.0 V 210 mAh
1.9.1 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 so that it can
resume it.
1.9.2 Battery Charging Control
Battery charging is controlled by TI BQ24725RGRR. When AC adapter and battery pack
are attached to the computer, the TI BQ24725RGRR 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.