How to choose the best mobile power pack

1 to see used batteries and batteries Level Mobile power with 18650 batteries and lithium polymer batteries are more 18650 product can do the small size, stylish, innovative, cheap prices, shortcomings: handled properly there will be a risk of explosion exists. Polymer batteries cost is relatively expensive, relatively bulky, the appearance of the square of the product, lack of fashion sense, but absolutely safe, do not explode, is called green energy in the 21st century the drawback: Level times or recycled polymer batteries also easy to bulge, insufficient discharge shortcomings 2, to see the size of the actual output current Some actual subscript 2A output current is only 1A or smaller, this is not to say, the output current with the mobile phone will be able to quickly complete charge, saving time, efficiency, and of course there is, consumers more charging current personal digital products, but also can be used, compatibility can be said Portable mobile power pack to be better, right in your hands, usb power pack you can sit mobile power pack back and relax To see the size of the actual discharge amount 3, the current market style a lot of capacity there are many types, cohabitation, many exist xubiao capacity products, I heard a 5000mah capacity power only for 1.8 times actual phone powered this on many virtual standard Needed depends on the conversion efficiency This indicator is also very important, the output power / input current = conversion efficiency, of course, the middle will be some loss, there is also some loss of the adapter and the adapter cable, and personal products PCB, these losses are relatively small, high efficiency power supply, the output of electricity more, such as: 6000mAh power conversion efficiency is 70%, counted down 6000 * 70% = 4200mah (after conversion results), if the high efficiency, it would be bigger.