1. Turn your HP dv9804ca laptop over.
2. Find the laptop battery release button lock for your HP dv9804ca laptop.
3. Now that your HP dv9804ca 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 dv9804ca battery is removed, grab your replacement HP dv9804ca battery for installation.
6. Insert the battery into the slot. Push the HP dv9804ca battery towards the laptop and secure it in place.