1. Turn your HP DV8100Z laptop over.
2. Find the laptop battery release button lock for your HP DV8100Z laptop.
3. Now that your HP DV8100Z 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 DV8100Z battery is removed, grab your replacement HP DV8100Z battery for installation.
6. Insert the battery into the slot. Push the HP DV8100Z battery towards the laptop and secure it in place.