Power up your WORX tools with this high-quality 4.0Ah battery pack. The pack features Lithium-Ion technology for reliable and long-lasting power. With a voltage of 20V, this black battery is perfect for your DIY tools and workshop equipment. The wa36644 WORX 4.0Ah battery pack is a must-have for any power tool enthusiast. It is compatible with a range of WORX tools and is designed to provide you with the power you need to get the job done. Whether you are working on a DIY project or tackling some heavy-duty tasks, this battery pack is the perfect solution.