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 Input Red wire (): Connect the positive pole of the adapter (red wire); Black wire (-): Connect the negative pole of the adapter (black wire); Output Yellow wire (): Connect to the positive pole of the load (); Black wire (-): connected to the negative pole of the load (-); 2. Things to note a. The buck does not have a reverse connection protection function. Please be sure to confirm the positive and negative poles of the adapter and the load before wiring to avoid reverse connection and burning the buck and the load; b. The input end must sufficient voltage and power to drive the output device; c. The voltage of the device driven by the output end must be the same as the voltage output by the buck converter, and the power required by the load device cannot be e maximum carrying power of the converter; Material: Plastic,Metal colour: Red Package Contents: 1 x Adapter with voltage converter (Assembled, battery not included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.