1. Turn your Lenovo U450P laptop over.
2. Find the laptop battery release button lock for your Lenovo U450P laptop.
3. Now that your Lenovo U450P 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 U450P battery is removed, grab your replacement Lenovo U450P battery for installation.
6. Insert the battery into the slot. Push the Lenovo U450P battery towards the laptop and secure it in place.