Toshiba M40, Satellite manual Batteries, Main Battery, Battery Charging Control

2.0 Batteries 1 Hardware Overview

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

1.1.1Main 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.

1.1.2Battery 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.

Table 1-8 Quick/normal charging time

Satellite M40/M45 TECRA A4 dynabook Vx/4 Maintenance Manual 25