1. Turn your Gateway MD7801U laptop over.
2. Find the laptop battery release button lock for your Gateway MD7801U laptop.
3. Now that your Gateway MD7801U 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 MD7801U battery is removed, grab your replacement Gateway MD7801U battery for installation.
6. Insert the battery into the slot. Push the Gateway MD7801U battery towards the laptop and secure it in place.