1. Turn your Sony VGN-NW240F laptop over.
2. Find the laptop battery release button lock for your Sony VGN-NW240F laptop.
3. Now that your Sony VGN-NW240F 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-NW240F battery is removed, grab your replacement Sony VGN-NW240F battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-NW240F battery towards the laptop and secure it in place.