1. Turn your HP X18 laptop over.
2. Find the laptop battery release button lock for your HP X18 laptop.
3. Now that your HP X18 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 X18 battery is removed, grab your replacement HP X18 battery for installation.
6. Insert the battery into the slot. Push the HP X18 battery towards the laptop and secure it in place.