1. Turn your Gateway M7800 laptop over.
2. Find the laptop battery release button lock for your Gateway M7800 laptop.
3. Now that your Gateway M7800 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 M7800 battery is removed, grab your replacement Gateway M7800 battery for installation.
6. Insert the battery into the slot. Push the Gateway M7800 battery towards the laptop and secure it in place.