Polymer li-ion Battery pack 1.high energy density 2.high working voltage 3.high discharge rate 4.long cycle life Bluetooth,Mp3,Mp4,Gps,E ... reading pen,mobile power,electronic cigarette , etc7.4v 700mAh Polymer li-ion Battery pack Adventage:Green product various dimensionsLow impendenceExcellent discharge performanceExcellent storage performance ...