Milwaukee M18 B4 18v REDLITHIUM 4.0Ah Li-Ion Battery Twin Pack This twin pack of Milwaukee M18 B4 18v REDLITHIUM 4.0Ah Li-Ion Batteries is compatible with all tools in the Milwaukee M18 range. They deliver up to 2x more run time, up to 20% more power and up to 2x more battery life compared with other Lithium-Ion technologies, and feature REDLITHIUM™ protection with REDLINK™ digital overload protection to prevent users from damaging their cordless power tool investment in abusive situations. FEATURES Deliver up to 2x more run time, up to 20% more power and up to 2x more battery life compared with other Lithium-Ion technologies and/or with previous Milwaukee battery technology (results depend on tool and application) REDLITHIUM™ protection with REDLINK™ digital overload protection to prevent users from damaging their cordless power tool investment in abusive situations Individual cell monitoring ensures optimal charge and discharge for maximum life Durable metal frame battery construction with shock responsive separators preventing pack failure from excessive vibrations or drops Water protection routes water away from the electronics & out of the battery pack Can be used in extreme temperatures down to -20 °C without compromising on runtime and battery life On-board battery fuel gauge helps the user to maximise his battery run-time efficiency SPECIFICATION Article Number: 4932430063 Battery Pack Capacity: 4.0Ah Battery Type: Li-Ion Charge Time With M12-18 FC Charger (Per Battery): 52 minutes Weight (Per Battery): 0.7kg Voltage: 18v