1. Turn your Sony VGN-FE660G laptop over.
2. Find the laptop battery release button lock for your Sony VGN-FE660G laptop.
3. Now that your Sony VGN-FE660G 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-FE660G battery is removed, grab your replacement Sony VGN-FE660G battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-FE660G battery towards the laptop and secure it in place.