The OEM Milwaukee M18 RedLithium High Output 8Ah Battery 48-11-1880 is a high-capacity rechargeable battery suitable for Milwaukee power tools. It features a Lithium-Ion (Li-Ion) battery technology with a voltage of 18V and a battery capacity of 8 Ah, providing long-lasting power for extended use. This Milwaukee battery is compact with dimensions of 5.46 inches in length, 3.3 inches in width, and 3.22 inches in height, making it convenient for use in various power tool applications.