Provides up to 2.5x more run time, up to 20% more power and up to 2x longer battery life compared to other Li-ion technologies and/or previous Milwaukee© battery technology. (Results depend on tool and application). REDLITHIUM-ION protection with Milwaukee© REDLINK™ digital overload protection to prevent users from damaging the casing of their cordless power tool in abusive situations. Individual cell monitoring ensures optimal charging and discharging for maximum lifespan. Durable metal frame battery construction with shock-responsive spacers that prevent package failure from excessive shock or drops. Water protection keeps water out of the electronics and out of the battery. Extreme hot and cold operating temperatures down to -20°C extend time and life. The built-in battery fuel gauge helps the user maximize the efficiency of their battery run time