The Milwaukee M18 B4 battery features REDLINK intelligence, as well as surge protection that efficiently protects the device from damage. Built-in temperature management keeps the Milwaukee M18 B4 battery at the ideal working temperature for optimal life. Technical data: • Red Li-Ion batteries are lighter and offer up to 20% more power • Consistently high performance until completely discharged • Consistent performance even under extreme working conditions, e.g. at temperatures down to -20°C • Up to 40% longer runtime and a shorter charging time compared to standard lithium-ion batteries • No memory effect - less susceptible to capacity loss during charging and therefore more durable • at full power capacity • overload protection by RED...