I think people generally say that product of china have no guarantee and its never last long, they are true, exactly I bought this Mi powerbank about a month ago.
First week its service is super.I use to say people that Mi is a good brand you should trust on that and buy Mi product.
First week I am satisfied buy my this new Mi powerbank its battery life is also good.But after someday when I charged the powerbank it take charge but whenever I plugged the pin to charge my mobile from this powerbank it took charge for a while and it disconnectsd.
I think this powerbank is worst powerbank. I spend eight hundred bucks to buy this powerbank.And now in only a month this lovely looking powerbank is as a past dream.
Really its looks cool.but worst battery life.
Trust me I can upload a video if you want.