1. Turn your Sony VGN-FW140N laptop over.
2. Find the laptop battery release button lock for your Sony VGN-FW140N laptop.
3. Now that your Sony VGN-FW140N 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-FW140N battery is removed, grab your replacement Sony VGN-FW140N battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-FW140N battery towards the laptop and secure it in place.