Sony VAIO PCG-SR21K User Manual page 19

Using your notebook
Charging the battery pack
To charge the battery pack, proceed as follows:
1 Connect the AC adapter to the computer.
2 Insert the battery pack.
The computer automatically charges the battery (1) (the battery indicator (2) 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 two and a half hours. To charge the battery completely, continue
charging for an additional hour.
battery indicator light status
on
single blink
double blink
off
meaning
The computer is using battery power.
The battery is running out of power.
The battery is charging.
The computer is using AC power.
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