Milwaukee 48-11-2420 (2) M12 REDLITHIUM 2.0 Compact 12V Batteries & M12 Lithium-ion Battery Charger (48-59-2401) KIT Provides optimized performance and overload protection using total system communication between tool Best-in-class construction: Offers long-lasting performance and durability Fuel gauge onboard: Displays remaining runtime for less downtime on the job