Milwaukee M12 B4 12v 4.0Ah Li-Ion Battery Twin Pack The Milwaukee M12 B4 12v 4.0Ah Li-Ion Battery delivers 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). FEATURES 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 Integrated welded frame battery construction with shock responsive separators preventing pack failure from excessive vibrations or drops Can be used in extreme temperatures down to -20 °C without compromising on runtime and battery life Discharge protection prevents cell damage from over-discharge SPECIFICATION Battery Pack Capacity: 4.0Ah Battery Type: Li-Ion Charge Time With C12 C Charger: 80 minutes Weight: 0.4 kg Voltage: 12v Part Number: 4932430065