The Milwaukee M18B4 18V 4.0Ah RedLithium-Ion Battery is a high-quality power tool battery designed for DIY enthusiasts and professionals alike. With Lithium-Ion technology, this battery offers long-lasting power and durability. The 4Ah capacity provides ample power for a variety of tools, while the 18V voltage ensures reliable performance. Trusted for its reliable brand and innovative battery technology, this product is essential for anyone in need of a powerful and efficient battery for their tools.