The Milwaukee M18B5 battery is equipped with advanced electronics and overload protection to prevent damage to cordless power tools. Its temperature management system ensures the battery stays within an ideal temperature range for maximum life. This Milwaukee 18V battery also features individual cell monitoring for optimal charging and discharging, and discharge protection to prevent cell damage. Compared to other Lithium-Ion technologies or previous Milwaukee® battery technology, the M18B5 offers up to twice the run time, 20% more power, and up to twice the recharges. The battery is also durable, with a metal frame construction and shock-responsive separators to prevent pack failure from excessive vibrations or drops. It is water-resistant and can be used in extreme temperatures down to -20°C without compromising runtime or battery life. An on-board fuel gauge helps users maximize their battery run-time efficiency.