1. Turn your Compaq NX9500 laptop over.
2. Find the laptop battery release button lock for your Compaq NX9500 laptop.
3. Now that your Compaq NX9500 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 Compaq NX9500 battery is removed, grab your replacement Compaq NX9500 battery for installation.
6. Insert the battery into the slot. Push the Compaq NX9500 battery towards the laptop and secure it in place.