The Samsung 18650 Battery is delivering more power and efficiency of small systems. It is a 3.6V 2500mAh battery that fulfills the requirements of low resistance. This compatible battery is featured with Lithium Manganese Nickel for more efficiency. If you are looking for the genuine battery for low resistances and sub-ohm mods that it can provide the ideal features to these systems. Samsung has done a great job on the new 18650 R5. This 3.6v 2500mAh model has been redone with lithium magnesium-nickel for its flat top contact. The R5 features a Li-ion rechargeable battery made for safe sub-ohm/low resistance vaping. Recommend the best flat top battery needed for some box mods.