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The Perfect Battery & Charger Kit for Flashlight and Other Devices Tenergy 18650 Li-Ion batteries offers your premium Flashlights a more energy efficient solution that extends run-time & maintains high light output. The kit offers a compatible smart charger capable of properly charging 18650, 18500, 14500 Li-Ion batteries quickly & with ease - automatically detects fully charged batteries to prevent overcharge and damaging your Li-Ion batteries. With one of the lowest prices, battery longevity, and higher number of charge cycles this is truly a high valued buy. Tenergy 18650 Li-Ion Battery Features & Benefits Internal PCB protection (patent pending design) prevents under-voltage at 2.5V and over-voltage at 4.25V. Manufactured under ISO9001-2000 to assure quality Common battery Applications: Flashlights, Lighting or other device that needs 3.7V power, Building portable power device needing high energy density and low weight, & More! Detailed Battery Specifications: Capacity* Nominal 2600 mAh, Minimum 2500 mAh Dimensions: Diameter: 19 mm Height: 69.5 mm Weight (Typical) Approx. 50 g Nominal Voltage: Average 3.7V Discharge Voltage: 3.0V Internal Impedance: less or equal to 130 milliohm (with PTC) Cycle Performance: 90% of initial capacity at 400 cycles Cycle life: > 500 cycles Standard Charge Current: 0.2C (Cut-off Current: 0.01C) Fast Charge Current: 0.5C (Cut-off Current: 0.01C) Standard Discharge Current: 0.5C (End Voltage = 2.75V) Max. Discharge Current: 1.5C Tenergy TN270 2-Bay Li-ion 18500/18650/14500 Smart Battery Charger Features & Benefits Worldwide voltage for AC 100-240V (50Hz~60Hz) input. Charger Specifications: Rated input voltage AC 100V - AC 240V (50Hz/60Hz) DC 12V - 24V 500mA Output voltage: 4.2V 500mA x 2 Weight: 166g Dimension: 134mm x 55mm x 30mm Normal use temperature: 0℃ to 40℃ Storage temperature: -10℃ to 70℃