Sony VAIO VAIO PCG505F User Manual page 22

Connect the AC adapter to the computer.
Insert the battery pack.
The computer automatically charges the battery (the battery indicator
light flashes in a double blink pattern as the battery charges). When the
battery is 85% full, the battery indicator light turns off. This process takes
approximately one and one half hours. To charge the battery completely,
continue charging for an additional hour.
A fully charged battery pack provides power for:
PCG-505FX Approx. 1.0 to 2.5 hours
PCG-505F Approx. 1.0 to 2.5 hours
The time varies based on your system configuration. See "Displaying
Detailed Battery Information" on page 69 for details on checking the
battery life.
The battery indicator light on the front of the computer
status of the battery pack
On
Single blink
Double blink
Off
.
The computer is using battery power.
The battery is running out of power.
The battery is charging.
The computer is using AC power.
Approx. 2.5 to 5.5 hours
Approx. 3.0 to 6.0 hours
indicates the