Sony VAIO VGN-FW Series Operating Instructions - Hardware Manual page 20

Getting Started >
Using the Battery Pack
4 Push the battery pack down into the compartment until it clicks into place.
5 Slide the battery LOCK switch outward to secure the battery pack on the computer.
✍
When your computer is directly connected to AC power and has a battery pack installed, it uses power from the AC outlet.
!
For your safety, it is highly recommended that you use genuine Sony rechargeable battery packs and AC adapters that meet the quality assurance
standards and supplied by Sony for your VAIO computer. Some VAIO computers may operate only with genuine Sony battery packs.
n 20 N