Sony Vaio PCG-FX301 User Manual page 26

Using your notebook
Charging the second battery pack
To charge the second battery pack, proceed as follows:
1 Keep the battery pack (1-3) in the computer while it is connected to AC power.
The battery indicator (2) flashes while the battery is charging.
2 When the battery indicator stops flashing, the battery is fully charged.
n N
26