Promotional powerbanks can be divided into three main groups: EMERGENCY | SINGLE GOOD CHARGE | LARGE CAPACITY multi charge. You can easily tell which is which by the size of the item. You pay for charging capacity. Powerbanks sold by promotional product companies are the same quality as those brand names sold in retail stores. We talk to the people who travel to overseas trade shows to source these products so talk to us about what best suits your needs. Everyone needs a powerbank these days!