Power conversion efficiency can reach 95%. Step down converter compatible with Milwaukee 18-volt Li-ion batteries (48-11-1815 / 48-11-1820 / 48-11-1828 / 48-11-1840 / 48-11-1850 / 48-11-1860, etc.) Power adapter connector is well-made, snug fit your battery, can install and lock battery easily.
eBay