This twin pack includes the Dewalt DCK2050H2T 18v XR Brushless Powerstack Combi Hammer + Impact in a Tstak case, which has now been paired with the Dewalt DCG405N-XJ Angle grinder . Compact Brushless Powerstack Twin Kit DCK2050H2T includes the same G3 Combi and Impact Driver as the DCK2050E2T but with upgraded 5.0ah DCBP518-XJ Powerstack Batteries The DEWALT Powerstack DCBP518 5.0ah 18v Battery utilises pouch cells to give you greater productivity than before. Get 50% more power* enabling faster application speeds and increased productivity with more than 50% more work per charge** using this battery that works with all the 18V XR tools you already have. This DCBP518 battery provides twice the lifetime*** and features an impact-resistant, overmolded base with non-marring material.Powerstack battery technology - the most powerful, compact and lightest weight battery. The next dimension of power is now available in 5.0ah*vs. DEWALT DCB184 battery, not in application **Usable energy vs.