Very bad product, Iwill suggest you to don, t purchase .I suppose that price is not more but what the need to purchase the product which is not able to satisfy you. I have paid for a bad thing.the battery not ever work for long time, not a long life product, only looking fashionable and it will also disturb the batery of mobile, your mobile battery also being disturbed by charging here.I leave it and save my mobile battery, now when I charge direct via electricity charging back up is perfect.