1. Turn your Gateway NV42 laptop over.
2. Find the laptop battery release button lock for your Gateway NV42 laptop.
3. Now that your Gateway NV42 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 NV42 battery is removed, grab your replacement Gateway NV42 battery for installation.
6. Insert the battery into the slot. Push the Gateway NV42 battery towards the laptop and secure it in place.