1. Turn your Sony VGN-A72PS1 laptop over.
2. Find the laptop battery release button lock for your Sony VGN-A72PS1 laptop.
3. Now that your Sony VGN-A72PS1 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-A72PS1 battery is removed, grab your replacement Sony VGN-A72PS1 battery for installation.
6. Insert the battery into the slot. Push the Sony VGN-A72PS1 battery towards the laptop and secure it in place.