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With the Milwaukee M18 NRGCR-502 energy kit, you provide dependable power to your Milwaukee M18 tools in tough workshop and maintenance environments. The two included M18 B5-CR 5.0 Ah Li-ion battery packs feature a glass-filled nylon housing designed to resist harsh oils, greases, and solvents, preventing casing degradation and cracking. The included M12-18 fc fast charger recharges a 5.0 Ah battery in just 59 minutes, minimizing your downtime. Capable of charging Milwaukee M12, M14, and M18 batteries, this kit delivers a continuous, reliable workflow across all your heavy-duty cordless applications.