DeWalt DCBP518-XJ DCBP034-XJ 18v XR Powerstack Battery Twin PackPOWERSTACK. THE NEXT DIMENSION IN POWER.This twin pack includes the following1x DCBP518 18v XR 5.0Ah Powerstack Battery1x DCBP034 18v XR 1.7Ah Compact Powerstack BatteryDCBP518-XJFEATURESGet 50 more powerWorks with all the 18V XR tools you already haveFaster application speeds and increased productivitySPECIFICATIONVoltage 18vDCBP034-XJFEATURESThe stacked pouch cell battery technology provides a low impedance construction meaning that the rate of flow of electrons is much higher thanks to the innovative internal pouch battery connectors and electrodes providing a greater surface area vs a traditional cylindrical battery cell typeA low impedance construction translates into much higher max watts out, providing more power to your power tools and unlocking the 18v power tool potential to new heights - increasing the application speed significantlyStacked pouch cell batteries also benefit from superior thermal performance vs cylindrical batteries. This ultimately increases battery durability, improves the cycle life and results in a much greater return on investment for your kit25 more compact, 15 less weight and a unique rubber overmold as a complete battery pack vs a DeWalt DCB183 18v 2.0Ah Battery PackWorks with the complete line of 18v XR tools and chargersSPECIFICATIONVoltage 18 VoltBattery Capacity 1.7Ah