The Milwaukee M18 B5 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 twice the run time, 20% more power and up to twice the recharges compared to other Lithium-Ion technologies or with previous Milwaukee® battery technology. Results dependant on voltage, tool and application. Battery Capacity: 5.0Ah.Battery Chemistry: Li-Ion.Voltage: 18 Volt.