The Milwaukee M18 Red Lithium-Ion Battery 4.0Ah is a reliable and durable power tool accessory designed for DIY enthusiasts and professionals alike. With a high capacity of 4 Ah and a voltage of 18 V, this battery provides long-lasting and efficient power for a variety of tools. The red colour gives it a sleek and stylish look, while the lithium-ion technology ensures a lightweight and compact design. Tested and working, this Milwaukee battery is a must-have for anyone in need of a reliable power source for their tools.