Sony Vaio PCG-GR114EK Instruction & Operation 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.
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