The Milwaukee M18 B6 REDLITHIUM-ION™ Slide Battery Pack is fitted with REDLINK™ Intelligence & 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 & shock responsive separators to protect the battery from damage. With individual Cell Monitoring which ensures optimal charge & discharge for maximum life & discharge protection which prevents cell damage from over-discharge. They offer up to twice the run time, 20% more power & up to twice the recharges compared to other Lithium-Ion technologies or with previous Milwaukee® battery technology. Results dependant on voltage, tool & application. Battery Capacity: 6.0 Ah. Battery Chemistry: Li-ion. Voltage: 18 Volt.