18V compact lithium-ion battery fits in tight spaces and reduces user fatigue. REDLINK intelligence provides optimized performance and overload protection using total system communication between tool, battery and charger. Onboard fuel gauge displays remaining runtime for less downtime. All-weather performance delivers fade-free power in extreme jobsite conditions. Runs cooler and performs in climates below 0 F (degrees Fahrenheit). Powers Milwaukee M18 cordless tools.