1.Mk-18 Battery Specifications: This Mk-18 battery replacement features a high-capacity 9.0Ah (9000mAh) Li-ion battery, operating at 18V with 162W of power. Weighing 920g, it includes a charge level indicator that displays battery status with the press of a button. 2.Compatible Models: Designed for Milwaukee Mk-18 series, this 9.0Ah battery is compatible with models like 48-11-1850, 48-11-1840, 48-11-1815, 48-11-1820, 48-11-1852, 48-11-1828, 48-11-1822, and more. 3.Expanded Compatibility: Works seamlessly with Milwaukee M18 Cordless Tools such as 2646-22CT, 2643-21CT, 2641-21CT, 2646-21CT, 2646-20, 2642-21CT, 2641-20, 2729-22, 2629-22, 2729-20, and 2729-21. 4. & Protection: Premium Li-ion battery cells provide fast charging and energy efficiency, with no memory effect. Built-in protection prevents over-charging, over-discharging, over-voltage, over-current, and short-circuit risks.