Milwaukee M12 12V REDLITHIUM 1.5Ah Lithium-Ion Battery 48-11-2401Description:This Milwaukee battery is 65% lighter and 50% smaller than a compact battery yet delivers long run time and fade-free power. This REDLITHIUM battery was designed with superior pack construction technology and performance to get optimal work per charge and work over pack life. Use this 16 watt-hour battery to power your Milwaukee M12 cordless power tools.