1. Turn your Compaq ZE4300 laptop over.
2. Find the laptop battery release button lock for your Compaq ZE4300 laptop.
3. Now that your Compaq ZE4300 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 Compaq ZE4300 battery is removed, grab your replacement Compaq ZE4300 battery for installation.
6. Insert the battery into the slot. Push the Compaq ZE4300 battery towards the laptop and secure it in place.