1. Turn your Sony VGN-A140B laptop over.
2. Find the laptop battery release button lock for your Sony VGN-A140B laptop.
3. Now that your Sony VGN-A140B 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-A140B battery is removed, grab your replacement Sony VGN-A140B battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-A140B battery towards the laptop and secure it in place.