Sony VAIO PCG-R505TE Service Manual page 119

The battery indicator light on the front of the computer indicates the status
of the battery pack.
Battery Indicator Light
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Battery Indicator
Light Status
On
Single blink
Double blink
Off
✍
Both the battery and power indicators blink when the battery is running out of power.
Meaning
The notebook is using battery power.
The battery is running out of power.
The battery is charging.
The notebook is using AC power.
Connecting a Power Source
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