1. Turn your Sony VGN-FS550 laptop over.
2. Find the laptop battery release button lock for your Sony VGN-FS550 laptop.
3. Now that your Sony VGN-FS550 laptop battery is unlocked, find the battery release button down.
4. Holding the laptop battery release button, gently pull your battery away from the laptop.
5. Now that your Sony VGN-FS550 battery is removed, grab your replacement Sony VGN-FS550 battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-FS550 battery towards the laptop and secure it in place.