Hi, the same thing happened to my battery as well. The battery issue is one that was reported by Lenovo. You go to the site and check to see if the battery falls under the replacement program that they have. If the battery fails when the site runs the check, it should bring you to a webpage where you give your address to Lenovo for them to send you a replacement battery. The web page where you can check the battery is:
I hope this helps!