Keep your spare 18650s safe and secure with the MecArmy B18 Battery Case! This durable polycarbonate container is able to house up to six 18650 Lithium-Ion batteries, making them safe and easy to store or carry with you wherever you go! The B18's lid screws on tightly and are padded on the inside to provide extra cushion for the cells. The battery case is incredibly impact resistant and is completely waterproof when sealed, allowing you to bring your spare power sources just about anywhere safely!