I bought this power bank before 3 months.When I bought this power bank I was very happy.I used this power bank for about 7 times and its polish stars removing.and when used this for about 1 and half months it stopped working and I felt very upset. The main problem of mivi is that there are very less centress of mivi.So I was not founded any centre near to my village.So I thrown this power bank in rubbish.So it is my experience with this power bank.