Mi Power Bank 2i 20000 mAh is a poor quality product. I didn’t like the product that much. I bought it from flipkart and of black colour. The built quality is really poor and it gets heated after a little use and then it stops working which is not at all acceptable also the usb cable that comes with is stoped working after a week of use and so I had to buy a new usb cable for it. On top of it it takes a lot of time to get fully charged but the charge doesnot last long.My mobile is of 3000 mAh and so with the fully charged Mi power bank 2i 20000 mAh my mobile should get charged at least 6 times when my mobile is dead but I observed that my mobile does not even gets charged completely 3 times.So I would say not to purchase this Power Bank