1. Turn your HP DV4015AP laptop over.
2. Find the laptop battery release button lock for your HP DV4015AP laptop.
3. Now that your HP DV4015AP 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 DV4015AP battery is removed, grab your replacement HP DV4015AP battery for installation.
6. Insert the battery into the slot. Push the HP DV4015AP battery towards the laptop and secure it in place.