1. Turn your Compaq 1200 laptop over.
2. Find the laptop battery release button lock for your Compaq 1200 laptop.
3. Now that your Compaq 1200 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 1200 battery is removed, grab your replacement Compaq 1200 battery for installation.
6. Insert the battery into the slot. Push the Compaq 1200 battery towards the laptop and secure it in place.