1. Turn your Gateway MX6915j laptop over.
2. Find the laptop battery release button lock for your Gateway MX6915j laptop.
3. Now that your Gateway MX6915j 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 MX6915j battery is removed, grab your replacement Gateway MX6915j battery for installation.
6. Insert the battery into the slot. Push the Gateway MX6915j battery towards the laptop and secure it in place.