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1.10 Batteries
1.10 Batteries
The computer has the following three types of batteries:
Main battery pack
Real time clock (RTC) battery
Secondary battery pack (Optionally installed in the selectable bay)
Table 1-6 lists the specifications of these batteries.
Battery name
Main battery pack (6 cells)
RTC battery
Secondary battery pack (6 cells)
1.10.1
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.
1.10.2
Battery Charging Control
Battery charging is controlled by LPC 47N253. When the AC adapter and battery pack are
attached to the computer, the LPC 47N253 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.
Satellite M20 Maintenance Manual
Table 1-7 Battery specifications
Lithium Ion
Lithium Ion
Lithium Ion
Table 1-8 Quick/normal charging time
Off-state charge
About 3 hours
On-state charge
About 5 hours
Material
Output voltage
10.8 V
3.0 V
10.8V
Charge time
1 Hardware Overview
Capacity
4,300 mAh
17 mAh
3,600 mAh
1-19
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