1. Turn your Compaq 2505AP laptop over.
2. Find the laptop battery release button lock for your Compaq 2505AP laptop.
3. Now that your Compaq 2505AP 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 2505AP battery is removed, grab your replacement Compaq 2505AP battery for installation.
6. Insert the battery into the slot. Push the Compaq 2505AP battery towards the laptop and secure it in place.