Specification Type Sanyo 3 7V 2600MAH UR18650ZY 18650 BatteryBrand SanyoModel Number Sanyo UR18650ZYFeature Convex head designCapacity 2600MAHNominal Voltage 3 6 3 7VInternal resistance 35 50milliohmColor Red and purple headWeight 49g pcsSize DxL 18x65 mmPackage Included 4 xSanyo UR18650ZY 18650 Battery