1、Good Compatibility: This electric tool battery adapter is compatible with for Ryobi 40V batteries, making it easy to install and lock your batteries in place. 2、Overcurrent Protection: This dock battery adapter is equipped with fuses (3 included) and excellent silicone red copper wires to prevent excessive transient currents from damaging the battery and equipment. 3、Excellent ABS Material: This electric tool battery converter is made of excellent ABS material for the shell, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. 4、Compact And Portable: This battery dock power connector is small in size and light in weight, which is very convenient to carry around and use. 5、DIY Function: This battery adapter is a positive and negative output bracket with 14 gauge wires installed and a maximum allowable current of 30A. You can DIY it according to the actual use requirements.