The new Milwaukee M18HB5.5 High Output 5.5AH Battery Pack provides up to 50% more power vs M18 Redlithium-ion battery packs. Its REDLink intelligence, this ensures that the battery is always in peak condition to offer you optimal performance. It can run at 50% cooler than previous models, even when being used for heavy applications allowing you to push your tools harder and longer.Patented REDLINK intelligence protects the pack from tough jobsite conditions to ensure optimum performanceRunsup to 50% cooler than other M18 REDLITHIUM-ION battery packs through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever beforeDrives complete corded replacement on the job site with more run time than ever beforeDurable metal frame battery construction with shock responsive separators prevents pack failure from excessive vibrations or dropsOn-board battery fuel gauge helps the user to maximise battery run-time efficiencyIndividual cell monitoring ensures optimal charge and discharge for maximum lifeCompatible with all M18 tools in the rangeProduct Weight: 0.65kgVoltage: M18Battery Type: Lithium-ionBattery Capacity: 5.5AhBattery Compatibility: Milwuakee M18 Li-ion