Perfectly compatible with Milwaukee M18 battery 18v series 48-11-1815 / 48-11-1820 / 48-11-1828 / 48-11-1840 / 48-11-1850 / 48-11-1860 and more. Power adapter connector is well-made, snug fit your battery, can install and lock battery easily. Battery adapter added switch ensures you can turn on & off the battery easily. Input voltage range: DC 18V-20V; Output voltage: DC 12V; Output current: 15A MAX; Output Power 180W. Our voltage buck converter adopted synchronous rectification technology further improve conversion efficiency and good stability. Power conversion efficiency can reach 95%; Ripple wave: 50Mv; Starting delay time:2S. Better safety, voltage regulator equipped smart chip, provides Over-current, Over-load, Low-load, Over-voltage, Under-voltage, Over-heat and Short-circuit intelligent protection. We upgraded low voltage protection, this voltage converter built in over low voltage protection, auto shut off if the battery voltage is lower than 14.4v, protect your device