1. Turn your Compaq X1408AP laptop over.
2. Find the laptop battery release button lock for your Compaq X1408AP laptop.
3. Now that your Compaq X1408AP 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 X1408AP battery is removed, grab your replacement Compaq X1408AP battery for installation.
6. Insert the battery into the slot. Push the Compaq X1408AP battery towards the laptop and secure it in place.