Produtct Name: Fenix ARB-L18-3400 3.6V 18650 Protected Button Top Battery Brand: Fenix Model: ARB-L18-3400 Capacity: 3400mAh Nominal Voltage: 3.6v~3.7V Weight: 50g Size:(D)18.6mmx(H)69mm  Features: 1. 3400mAh high capacity battery with outstanding performance Three sets of over-heat protection. 2. Built-in over-charge and over-discharge protection circuit ensure the max performance of the battery. 3. Unique structural design for better impact-resistantPackage Included:1 x  Fenix ARB-L18-3400 3.6V 18650 Protected Button Top Battery