You can visit your nearest Mi Service Center and get your battery checked. If there is any problem with it physically then it will get replaced. But you will have to pay for it. And if they don't have the battery in stock then you might have to leave the phone with them for about 7 working days until the battery comes. Then the phone gets returned to you. I had a physical battery problem and I had seen some other complain as well. So its best to get it checked before the problem escalates.