Milwaukee M18 3.0Ah Red Lithium-Ion Battery M18BX,Milwaukee Red Lithium batteries are the next generation in Lithium-Ion technology, Compatible with all products in the M18 Cordless tool system, For use with Milwaukee M18 cordless tools, Milwaukee has designed and manufactured these 18Volt 3.0ah Hour Lithium-Ion batteries using the very latest technology and materials available, Features include increased Run-Time, Torque and Speed while supplying Fade-Free Power, A built-in Fuel Gauge shows at a glance the battery power that's still left in reserve so not caught out part way through a job, Genuine Milwaukee batteries have never been this affordable.