The Milwaukee M18 B9 REDLITHIUM-ION™ Slide Battery Pack is fitted with REDLINK™ Intelligence and overload protection, which prevents the user from damaging their tools. It has a temperature control cell frame that keeps the battery at an ideal temperature range to provide maximum life. There is a waterproof protection barrier, a rubber overmould and shock responsive separators to protect the battery from damage. With individual Cell Monitoring which ensures optimal charge and discharge for maximum life and discharge protection which prevents cell damage from over-discharge. They offer up to fives times more run time vs standard Milwaukee Lithium-Ion, twice the runtime vs Milwaukee 5.0Ah Lithium-Ion battery and 35% more power vs standard Milwaukee Lithium-Ion batteries. Results dependant on voltage, tool and application. Battery Capacity: 9.0Ah.Battery Chemistry: Li-ion.Voltage: 18 Volt.