1. Turn your HP dv9398eu laptop over.
2. Find the laptop battery release button lock for your HP dv9398eu laptop.
3. Now that your HP dv9398eu 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 dv9398eu battery is removed, grab your replacement HP dv9398eu battery for installation.
6. Insert the battery into the slot. Push the HP dv9398eu battery towards the laptop and secure it in place.