Versatile Battery - TAKEN 16650 battery compatible with certain model of flashight: such as m4, Olight M1T Raider Plus, arisaka 600 series light, Streamlight PolyTac..Important NOTE - This is 16650 3.7V battery, high capacity 16650 li-ion rechargeable batteries with button top. NOT AA Battery or 18650 Battery. NOT fits for P2X. Please confirm whether the battery model required by your device is 16650..No memory effect - The 16650 rechargeable li-ion battery can be charged over 500 times..Environmentally Friendly - It is super convenient to use and replace one-time-use battery to save environment by preventing the waste of non-rechargeable lithium 16650 battery..100% GUARANTEE - If you have any questions about the Product, please feel free to Contact us. I will give satisfactory service in the fastest time.