external battery pack for iphone,portable battery ,portable power for iPhone external battery pack for iphone,portable battery ,portable power for iPhoneSpecifications:weight:58gCapacity:1700mahCell type: Li-polymer batteryDimension:62*59*12.4mmOutput voltage:5VOutput current:700 mA maxCycle times:500 timesFunction&characterPower check and indicationPlug and play portable power for iPhone