This Milwaukee 18 V lithium-ion battery works on the M18 cordless tool system and has 1.5 amp hours of run-time. This battery powers over 40 Milwaukee M18 cordless tools. The M18 compact Red Lithium battery offers less weight and a reduced size than the M18 XC high capacity Red Lithium battery pack to reduce user fatigue. Managed by Milwaukee's exclusive REDLITHIUM intelligence, the battery features overload protection, a temperature management system, individual cell voltage monitoring, discharge protection and a battery fuel gauge.