The battery adapter works for 18V Li-ion battery 48-11-1815, 48-11-1850, 48-11-1820, 48-11-1840, 48-11-1815 and more. VOLTAGE CONVERTER: Wide voltage input: 17V~55V, output voltage: 12V, output current: 20A, power: 240W The Maximum conversion efficiency is up to 95% with the Synchronous Rectification Technology; We creatively combine the battery adapter and the voltage converter with 2 heat-resistant wires already, making it more easy to use. Just install the battery to the battery adapter and then connect the voltage converter to your device Battery Adapter: The fuse supply overpowers protection. The copper contact improves the conductivity and safety; Voltage Regulator: Equipped with smart chip, features Over-current, Over-load, Low-load, Short-circuit, Over -heat, over drain, and anti low voltage protection WIDE APPLICATION: Widely used for golf cart, motor, railway signals, car display screen, GPS, and etc Suitable for Lithium Battery.(without battery) 1. Wiring method Input Red