1. Turn your Gateway MX6641h laptop over.
2. Find the laptop battery release button lock for your Gateway MX6641h laptop.
3. Now that your Gateway MX6641h 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 MX6641h battery is removed, grab your replacement Gateway MX6641h battery for installation.
6. Insert the battery into the slot. Push the Gateway MX6641h battery towards the laptop and secure it in place.