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1 Hardware Overview 2.0 Batteries
26 Satellite M40/M45 TECRA A4 dynabook Vx/4 Maintenance Manual
2.0 Batteries
The computer has the following three types of batteries:
Main battery pack
Real time clock (RTC) battery
Table 1-7 lists the specifications of these batteries.
Table 1- 7 Battery specifications
Battery name Material Output voltage Capacity
6 Cell Lithium Ion 10.8 V 4300 mAh
Main battery pack
12 Cell Lithium Ion 10.8 V 8600 mAh
RTC battery Lithium Ion 3.0 V 7 mAh
1.1.1 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.
1.1.2 Battery Charging Control
Battery charging is controlled by LPC 47N249. When the AC adapter and battery pack
are attached to the computer, the LPC 47N249 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.