1. Turn your Lenovo 7666 laptop over.
2. Find the laptop battery release button lock for your Lenovo 7666 laptop.
3. Now that your Lenovo 7666 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 7666 battery is removed, grab your replacement Lenovo 7666 battery for installation.
6. Insert the battery into the slot. Push the Lenovo 7666 battery towards the laptop and secure it in place.