1. Turn your Lenovo 4233 laptop over.
2. Find the laptop battery release button lock for your Lenovo 4233 laptop.
3. Now that your Lenovo 4233 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 Lenovo 4233 battery is removed, grab your replacement Lenovo 4233 battery for installation.
6. Insert the battery into the slot. Push the Lenovo 4233 battery towards the laptop and secure it in place.