1. Turn your HP ZE4900 laptop over.
2. Find the laptop battery release button lock for your HP ZE4900 laptop.
3. Now that your HP ZE4900 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 ZE4900 battery is removed, grab your replacement HP ZE4900 battery for installation.
6. Insert the battery into the slot. Push the HP ZE4900 battery towards the laptop and secure it in place.