Worldwide voltage for 100-240V ACTwo independent charging channels for individual charging and detection Constant current and constant voltage charging mode Reverse polarity protection. It automatically terminates charging and the LED flashes red when the polarity is reversely connected Compact design Portable SafeSpecifications InputDC 12V 1000mA OutputDC 4.2V 1000mA per channel Applicable battery type18650/14500 rechargeable Li-ion battery Warning Don't disassemble the charger Don't charge other types of battery. It may cause explosion and breakage The charger is only for in-house using and should be kept away from heat surrounding Keep the charger away from humidity circumstances and no liquid is allowed to get in, otherwise it may cause damage and lead to accident It should be placed out of children's reach It may not be able to fully charge those batteries which have not been used for a long time. Several recycles of charge-discharge will improve the battery's performance* Please carefully read the instruction before using! Li-ion 18650 Cylindrical 3.7V 2600mAh Rechargeable Batteries (Button Top) with PCBUnique and New! With PCB protection!Li-Ion 18650 cylindrical rechargeable batteries with Internal Voltage protection PCB!Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V.Unique PCB design and patent pending.3.7V 2600mAh high capacityHigher energy density and lower weight than other rechargeable batteriesManufactured under ISO9001-2000 to assure qualityBattery tested based on International Electrotechnical Commission (IEC) standard to ensure capacity, quality and life timeApplications Lighting or other device that needs 3.7V powerBuilding portable power device needing high energy density and low weightWarning CAUTIONwhen working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled.User should have enough knowledge on Li-Ion rechargeable batteries in charging, discharging, and assembly before use.Put the batteries in fire-proof containerDo not put batteries on wood surface or carpet when chargingNever leave battery un-attended when chargingWe are not responsible for damage of any modification of the batteries in form, shape or made into packsWe are not responsible for any damage caused by misuse or mishandling of these Li-Ion batteriesProduct Specifications Capacity* Nominal 2600 mAh, Minimum 2500 mAhInternal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.35V. UNIQUE INTERNAL PCB!Dimensions:Diameter19 mm Height69.5 mmWeight (Typical) Approx. 50 gNominal VoltageAverage 3.7VDischarge Voltage3.0VInternal Impedanceless or equal to 130 milliohm (with PTC)Cycle Performance90% of initial capacity at 400 cyclesCycle life> 500 cyclesStandard Charge Current0.2C (Cut-off Current0.01C) Fast Charge Current0.5C (Cut-off Current0.01C)Standard Discharge Current0.5C (End Voltage = 2.75V)Max. Discharge Current1.5C.style2 {border-styl