1. Turn your Gateway S-7500N laptop over.
2. Find the laptop battery release button lock for your Gateway S-7500N laptop.
3. Now that your Gateway S-7500N 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-7500N battery is removed, grab your replacement Gateway S-7500N battery for installation.
6. Insert the battery into the slot. Push the Gateway S-7500N battery towards the laptop and secure it in place.