Any DIY job requires preparation, planning and persistence to get to completion. Part of that project planning is knowing exactly how much power youll need to run all those Motorhead 20V Ultra family of tools. Get piece of mind and grab some extra Motorhead 20V Ultra 4.0Ah batteries for your next job. With its high energy density, its perfect for saws, angle grinders and other high-draw power tools where maximum power and run-time are the priority. With its huge amount of available power, youll make more cuts, drive more bolts, grind more metal and get more done. Provide your tools with 2x the power over standard 2.0ah battery packs. Get the battery pack that delivers the peak power your Motorhead tools deserve.