2 x UltraFire 18650 Batteries:Protected 18650 3000mAh rechargeable 3.7 volt battery - charge with the Ultrafire Multi-Battery charger.These fully protected cells simplify usage with their integrated PCB. Perfect for your single cell application these cells are not for pack building as doing so will defeat the PCB protection which is matched to the correct voltage on a single cell. If you are building a pack please choose one of our other cells and the appropriate PCB.Features and BenefitsUnique and New! With integrated PCB Protection!Lithium Ion 18650 cylindrical rechargeable batteriesInternal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V.Unique PCB design and patent pending.Higher energy density and lower weight than other types rechargeable batteriesManufactured under ISO9001-2000 to assure qualityBattery tested based on International Electrotechnical Commission (IEC) standard to ensure capacity, quality and life timeDevices needing 3.7V powerBuilding portable power device needing high energy density and low weightProduct SpecificationsCapacity: Nominal&: 3000mAh, Minimum: 2450 mAhInternal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V. UNIQUE INTERNAL PCB!Dimensions:Diameter: 18.6+/-0.2 mm *Height: 66.5+/- 0.2mmWeight (Typical) Approx. 46 gNominal Voltage: Average 3.7VCut-off Voltage: 2.5VInternal Impedance: less or equal to 180 milli-ohm (with PTC)Cycle Performance: 90% of initial capacity at 400 cyclesCycle life: > 500 cyclesCharge: Current = 0.5C (~1500mA) Voltage = 4.2 V End Current = 0.01 mADischarge: Current = 0.5C (~1500mA) End Voltage = 3.0VRapid Charger:The UltraFire Rapid Charger will charge your batteries faster than any other charger on the market. It is intended for 3.7 Lithium Batteries and fits any size. 2 Batteries fit at one time.Fits all battery sizes!Complete Charge Light IndicatorInput 1: 100-240V 50-60HZInput 2: 12V= 400 mAOutput: 4.2 = 450 mACharge only with the following batteries:"14500""17500""18500""17670""18650"