These AWT 40A 3000mAh Batteries deliver a great hit and last a lot longer than lower capacity cells if you're using a high wattage mod. This lithium-ion battery's internal chemistry is similar to that of rechargeable power tools and batteries for electric vehicles. The battery offers the ideal performance qualities required to power contemporary, sub-Ohm vaping mods and has an excellent safety rating 40A 3000mAh Batteries are the same size as standard 18650 mod batteries in terms of physical dimensions.