1. Turn your Sony VGN-C240E laptop over.
2. Find the laptop battery release button lock for your Sony VGN-C240E laptop.
3. Now that your Sony VGN-C240E 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-C240E battery is removed, grab your replacement Sony VGN-C240E battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-C240E battery towards the laptop and secure it in place.