1. Turn your Compaq 725 laptop over.
2. Find the laptop battery release button lock for your Compaq 725 laptop.
3. Now that your Compaq 725 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 725 battery is removed, grab your replacement Compaq 725 battery for installation.
6. Insert the battery into the slot. Push the Compaq 725 battery towards the laptop and secure it in place.