Milwaukee 48-11-1820 M18 18v REDLITHIUM 2.0 Compact Battery Pack REDLINK Intelligence: Provides optimized performance and overload protection using total system communication between tool, battery and charger. Fuel gauge onboard: Displays remaining runtime for less downtime on the job. Versatility: Powers more than 40 Milwaukee M18 cordless power tools. Best-in-class construction: Offers long-lasting performance and durability. All-weather performance: Delivers fade-free power in extreme jobsite conditions. In easy-to-open bulk packaging to pass the savings on to you.