The power bank worked well for less than 3 months. Then it stopped charging altogether. I called the customer care number and was told that since it is in warranty it will be replaced post checking at the service center. Service center first said. It's charging. I told them to keep it on charge for a bit and see, it would not go beyond one light out of 4. They realized I was right and then proceeded to tell me that since there is a small dent in the corner on the body of the power bank they cannot replace it! Really? How come the dent didn't matter before they realised it was charging? On asking for their opinion on the situation in writing, they refused. Really bad service from Mi. Am never buying another Mi product again. They are cheats of the first order.