The DEWALT 18v XR 5Ah POWERSTACK Battery is a small but highly powerful compact battery compatible with all 18V tools. Compared to the DCB183 18V XR 2Ah battery, this powerstack battery is 25% more compact and weighs 15% less, all while delivering 50% more power than predecessors. Its low impedance construction means its power is increased immensely and it delivers an unbeatably superior thermal performance versus cylindrical cells. This means the recharge cycles are increased. In addition, it is smaller and more compactly designed than a cylindrical cell, ensuring no space is wasted. Ideal for professional and DIY use.