Milwaukee M18 HB5.5 18v HIGH OUTPUT 5.5Ah Li-Ion Battery Twin Pack  The new M18™ 5.5Ah HIGH OUTPUT™ battery pack provides up to 50% more power compared to the standard M18™ REDLITHIUM™ battery packs, and they are compatible with any of the tools in the Milwaukee M18 range. Supplied in a pack of 2. FEATURES Provides up to 50% more power vs M18™ REDLITHIUM™ battery packs Patented REDLINK™ intelligence protects the pack from tough jobsite conditions to ensure optimum performance Runs up to 50% cooler than other M18™ REDLITHIUM™ battery packs through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before Drives complete corded replacement on the job site with more run time than ever before Durable metal frame battery construction with shock responsive separators prevents pack failure from excessive vibrations or drops On-board battery fuel gauge helps the user to maximise battery run-time efficiency Individual cell monitoring ensures optimal charge and discharge for maximum life Compatible with all M18™ tools in the range SPECIFICATION Pack Quantity: x2 Pcs Battery Pack Capacity: 5.5Ah Battery Type: Li-Ion Charge Time With M12-18 FC Charger: 60 minutes Weight Per Battery: 1.1kg Voltage: 18v