1. Turn your Gateway MT6451 laptop over.
2. Find the laptop battery release button lock for your Gateway MT6451 laptop.
3. Now that your Gateway MT6451 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 MT6451 battery is removed, grab your replacement Gateway MT6451 battery for installation.
6. Insert the battery into the slot. Push the Gateway MT6451 battery towards the laptop and secure it in place.