1. Turn your Sony VGN-FS615F laptop over.
2. Find the laptop battery release button lock for your Sony VGN-FS615F laptop.
3. Now that your Sony VGN-FS615F 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-FS615F battery is removed, grab your replacement Sony VGN-FS615F battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-FS615F battery towards the laptop and secure it in place.