1. Turn your HP dv6405us laptop over.
2. Find the laptop battery release button lock for your HP dv6405us laptop.
3. Now that your HP dv6405us 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 dv6405us battery is removed, grab your replacement HP dv6405us battery for installation.
6. Insert the battery into the slot. Push the HP dv6405us battery towards the laptop and secure it in place.