Specifications: 3400 mAh high-capacity battery with outstanding performance Three sets of over-heat protection Built-in over charge and over discharge protection circuit ensure the max performance of the battery Unique structural design for better impact resistance 37.5% increase in runtime in the TK75 in high mode (test comparing runtime in the Fenix ARB-L2 2600 mAh battery and the ARB-L2S 3400 mAh battery) 500 Charge Cycles (A properly maintained ARB-L2S battery is designed to retain up to 70% of its original capacity at 500 full charge and discharge cycles) Built-in over charge and over discharge protection circuit to ensure the maximum performance of the battery Compact design, suitable for various high-intensity flashlights No battery memory effect, negligible self-discharge Technical Parameters: Model ARB-L2S Capacity: 3400 mAh Voltage: 3.6V Charging Current: Recommended 1A, maximum 2A Weight: 49g Size: Diameter 18.5mm, Height 68 mm Warranty Period: 12-month free warranty period from purchase date EdisonBright AA/AAA alkaline battery sampler pack included in bundle.