1. Turn your HP dv6604cl laptop over.
2. Find the laptop battery release button lock for your HP dv6604cl laptop.
3. Now that your HP dv6604cl 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 dv6604cl battery is removed, grab your replacement HP dv6604cl battery for installation.
6. Insert the battery into the slot. Push the HP dv6604cl battery towards the laptop and secure it in place.