1. Turn your Lenovo 550P laptop over.
2. Find the laptop battery release button lock for your Lenovo 550P laptop.
3. Now that your Lenovo 550P 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 550P battery is removed, grab your replacement Lenovo 550P battery for installation.
6. Insert the battery into the slot. Push the Lenovo 550P battery towards the laptop and secure it in place.