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Toshiba NB255 User Manual

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1.4 Batteries 
1 Hardware Overview 
NB250/NB255 Maintenance Manual 
1-11 
1.4 
Batteries 
The computer has the following two types of batteries: 
  Main Battery Pack 
  Real Time Clock (RTC) Battery 
 
1.4.1 
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 when the AC adapter is detached. 
 
1.4.2 
Battery Charging Control 
Battery charging is controlled by EC KB926. When the AC adapter and battery pack are attached 
to the computer, the EC KB926 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 1-2 
Quick/Normal Charging Time 
State Charge 
Time 
3 Cell 
About 4 hours 
Off-State Charge 
6 Cell 
About 6 hours 
On-State Charge 
3/6 Cell 
About 12 hours