The DEWALT DCBP034-XJ 18V XR Compact Powerstack Battery is a small but highly powerful compact battery compatible with all DEWALT 18v tools. Compared to the DCB183 18v XR 2 ah battery, this Powerstack battery is 25% more compact and weighs 15% less, but also delivers 50% more power than predecessors. Its low impedance construction means the power provided is increased immensely, and it delivers an unbeatable thermal performance compared with 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. The Powerstack battery is deal for for professional and DIY use.