1. Turn your Gateway MX6425 laptop over.
2. Find the laptop battery release button lock for your Gateway MX6425 laptop.
3. Now that your Gateway MX6425 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 MX6425 battery is removed, grab your replacement Gateway MX6425 battery for installation.
6. Insert the battery into the slot. Push the Gateway MX6425 battery towards the laptop and secure it in place.