1. Turn your Gateway S-7225C laptop over.
2. Find the laptop battery release button lock for your Gateway S-7225C laptop.
3. Now that your Gateway S-7225C 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 S-7225C battery is removed, grab your replacement Gateway S-7225C battery for installation.
6. Insert the battery into the slot. Push the Gateway S-7225C battery towards the laptop and secure it in place.