Every battery in this four-pack is the same resistant-housing M18 REDLITHIUM XC5.0 pack Milwaukee builds for automotive and manufacturing environments where oils, greases, and solvents are part of the job. Delivers 2.5X more runtime and 20% more power than standard lithium-ion batteries. Resistant housing provides increased protection against exposure to common oils, greases, and solvents found in automotive and manufacturing environments. Integrated temperature management and individual cell monitoring help maximize battery life. Durably built for heavy-duty use, runs cooler, and performs well in cold-weather climates. REDLINK Intelligence provides optimized performance and overload protection through total system communication between tool, battery, and charger. Fully compatible with 200+ Milwaukee M18 cordless power tools. All-weather performance delivers fade-free power in extreme jobsite conditions. Onboard fuel gauge displays remaining runtime at a glance. Discharge protection helps prevent cell damage.