1. Turn your HP G72-251XX laptop over.
2. Find the laptop battery release button lock for your HP G72-251XX laptop.
3. Now that your HP G72-251XX 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 HP G72-251XX battery is removed, grab your replacement HP G72-251XX battery for installation.
6. Insert the battery into the slot. Push the HP G72-251XX battery towards the laptop and secure it in place.