The DeWALT FlexVolt 20/60 Volt battery with a capacity of 9.0 Amp-Hours changes its voltage level depending upon the tools used. This battery can be used with 60 Volt power tools, 120 Volt tools and also with 20 Volt tools and chargers. LED light denotes the charging status of the battery. Patented technology of the battery with its large format cells ensures a cooler runtime even under a uniform discharge. Module is engineered with silicone that keeps the battery clean by eliminating dust and debris. Dual voltage facility offers great versatility. Each of the voltage level features a 180 Watt-hours of energy. This battery can also be used even up to 0 degree F temperature, sold as two per pack.