A landmark event from slow growth to the rapid growth was in 2007, Apple introduced the iPhone, stylish product design, powerful software features, which quickly subvert the smart phone market and in just a few years, it grew into global shipments of the first smart phone brand. IPhone with power consumption and the built-in lithium battery cannot be replaced and it can only be used up to 4 hours of continuous use. Thus, iPhone players started to become the largest customer of mobile power. Many Apple Authorized manufacturers have begun to emerge, such as Harry, and authorized mobile power brands are known for producing highly specialized iPhone / iPad mobile power. Iphone External Battery development has become the trend of this age.