inputs.text: solid juice box external battery pack - recently upgraded new smart phone unfortunately one drawbacks current crop high end powerful smart phones poor battery life new trent arcadia pack imp70d partially solves battery life problem 7000mah stored energy imp70d enough battery power provide almost three 3 complete charges new smart phone imp70d new must item computer bag imp70d two 2 standard usb ports used charge devices one 1 port capable providing 1 amp output second port capable providing 21 amps output power ports used simultaneously providing ability charge two 2 devices time used imp70d charge multiple phones well ipad hp touchpad imp70d uses microusb port powercharge port due modern phones also using microusb charge ports means not even carry \\special\\ cable wall wart charge imp70d phone uses microusb charger use charger imp70d imp70d solid feel small light enough carried womens purse case computer bag imp70d never worry dead battery phone furthermore rescued wife kids friends phones one occasion