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Conquer Mega Job Sites Without Charging Breaks Engineered for DEWALTs most demanding 20V MAX tools, this 8.5Ah ultra-high-density battery delivers 186 holes in pressure-treated lumber (DCD999 hammer drill) or cuts 52 sheets of ¾" plywood (DCS577 circular saw) on a single charge 35% longer runtime than OEM 8Ah batteries. Built for brutal conditions: -4°F Arctic Mode: Starts DCE100 snow blowers in Minnesota blizzards (OEM fails below 14°F) IP56 Weather Armor: Sealed against rain/snow/dust on bridge or roofing jobs UL/CE/FCC Certified: Flame-retardant casing survives 1000°C blowtorch tests Universal XR Platform Fit Seamless compatibility with: Heavy-Duty Tools: DCD999 Hammer Drill | DCS577 Saw | DCL050 Work Light Legacy Systems: DCB204-2 (2018) | DCB205-2 (2020) New Flagships: DCB208-2 (8Ah) | DCB207-2 (7Ah) | DCB206-2 (6Ah)