... lithium polymer battery)2, input voltage:5.5V>=0.5V;output voltage 5.5V>=0.5V 3, ... , make better use of battery energy.4.Unique high-technology, provide overcharge protection, over-discharge protection, ... 72 hours aging test, the product have high performance and high stability.6.fashionable design with mini measurement ... welcome.Welcome to our factory!! high quality for ipad 4 power bank from factory