1. Turn your HP dv6618ca laptop over.
2. Find the laptop battery release button lock for your HP dv6618ca laptop.
3. Now that your HP dv6618ca 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 dv6618ca battery is removed, grab your replacement HP dv6618ca battery for installation.
6. Insert the battery into the slot. Push the HP dv6618ca battery towards the laptop and secure it in place.