The Milwaukee M18B5 18V 5.0Ah battery delivers superior performance with up to 2.5x more run time, 20% more power, and 2x longer battery life compared to other Lithium-Ion technologies. It features individual cell monitoring for optimal charge and discharge, ensuring maximum lifespan. The durable metal frame construction with shock-responsive separators protects against vibration and drops, while water protection routes moisture away from electronics. This battery performs reliably in extreme temperatures down to -20 °C and includes an on-board fuel gauge for efficient runtime management. Compatible with all Milwaukee M18 tools.