1. Turn your Compaq 1100 laptop over.
2. Find the laptop battery release button lock for your Compaq 1100 laptop.
3. Now that your Compaq 1100 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 1100 battery is removed, grab your replacement Compaq 1100 battery for installation.
6. Insert the battery into the slot. Push the Compaq 1100 battery towards the laptop and secure it in place.