1. Turn your Compaq 2156AE laptop over.
2. Find the laptop battery release button lock for your Compaq 2156AE laptop.
3. Now that your Compaq 2156AE 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 2156AE battery is removed, grab your replacement Compaq 2156AE battery for installation.
6. Insert the battery into the slot. Push the Compaq 2156AE battery towards the laptop and secure it in place.