18V ONE+ 4Ah Battery

Never get caught powerless, as this RYOBI 18-Volt lithium-ion battery has a built-in 4-bar illuminated charge indicator to warn of diminishing capacity. This LITHIUM+ high-capacity battery stands up to frigid weather conditions down to 14 Degree F (-10 Degree C) and is engineered to run four times longer than a NiCd high-capacity counterpart. Strap this pack onto any 18-Volt cordless product in the ONE+ lineup for supreme performance.