1. Turn your Gateway NV73A12u laptop over.
2. Find the laptop battery release button lock for your Gateway NV73A12u laptop.
3. Now that your Gateway NV73A12u 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 NV73A12u battery is removed, grab your replacement Gateway NV73A12u battery for installation.
6. Insert the battery into the slot. Push the Gateway NV73A12u battery towards the laptop and secure it in place.