Toshiba P100/P105 - Manual (Page 113)

113 Mobile Computing
Monitoring main battery power
5.375 x 8.375 ver 2.3.2
The current power source and battery power remaining
section displays the current charge state of the battery.
The value displays as a percentage of remaining battery
charge.
Sample Power Meter tab of Power Options Properties
TECHNICAL NOTE: The computer drains the battery faster at
low temperatures. Check your remaining charge frequently if
you are working in temperatures below 50 degrees Fahrenheit.
The computer calculates the remaining battery charge based
on your current rate of power use and other factors such as the
age of the battery.