The M12™ 4.0 Ah Battery delivers up to 2× more runtime, 20% more power, and up to 2× longer battery life compared with other lithium-ion technologies or previous MILWAUKEE® batteries, depending on tool and application. Featuring REDLITHIUM™ protection with REDLINK™ digital overload control, it safeguards tools in demanding conditions. Individual cell monitoring optimises charge and discharge, while the welded-frame construction with shock-responsive separators prevents pack failure from drops or vibrations. It reliably operates in extreme temperatures down to –20 °C without affecting runtime or battery longevity.