This is a brand new genuine Milwaukee M12 48-11-2401 1.5 AH battery. It is a 12V lithium-ion battery that comes with a manufacturer warranty. The battery is red in color and has a capacity of 1.5 Ah. It is compatible with Milwaukee M12 power tools and is made in Korea. The battery is lightweight, weighing only 0.95 lbs, and has dimensions of 3.5 in x 3.3 in x 8.5 in.