1. Turn your Compaq X1090AP laptop over.
2. Find the laptop battery release button lock for your Compaq X1090AP laptop.
3. Now that your Compaq X1090AP 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 X1090AP battery is removed, grab your replacement Compaq X1090AP battery for installation.
6. Insert the battery into the slot. Push the Compaq X1090AP battery towards the laptop and secure it in place.