1. Turn your Gateway 6021GZ laptop over.
2. Find the laptop battery release button lock for your Gateway 6021GZ laptop.
3. Now that your Gateway 6021GZ 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 Gateway 6021GZ battery is removed, grab your replacement Gateway 6021GZ battery for installation.
6. Insert the battery into the slot. Push the Gateway 6021GZ battery towards the laptop and secure it in place.