Mp3 battery Model:HW502035 Nominal Voltage:3.7V Nominal Capacity:300mAh Application:mp3,mp4,bluetooth,etc. Mp3 batterySpecifications:Model:HW502035Nominal Voltage:3.7VNominal Capacity:300mAh Major Features:1.Excellent safety performance.2.Light weight: The polymer lithium cell is 40% lighter than the same specification of the steel liquid lithium cell,and 20% lighter than aluminium shell liquid ...