Hi guys we usually buy any powerbank for batry backup of our phone but this JBTEK Powera bank which is 10000 mah is very worst power bank becase it never charge my phone fully for even one time then how the company claims it of 10000 and when I charge this powebank it takes 3_ 4 hours to get charged and even then my phone gets only 40 percent backup so buy a good powerbank instead of this