This battery was pulled from a nonfunctioning screen 4th gen x1 carbon.  As the laptop was not able to turn on, I was unable to test the functionality of the battery to the fullest extent. But I was able to charge the battery and the device was able to hold power and stay on with the battery alone. The battery is not swollen and does not appear to have any issues that I can determine. The item is sold as is, buy at your own risk there is no refunds for the item. If you have any questions, please ask.