1、Suitable Models: Our battery adapter is perfectly compatible for M18, for 48 11 1860, for 48 11 1850, for 48 11 1840, for 48 11 1828, for 48 11 1820, for 48 11 1815 lithium ion battery. 2、Operation Method: The red wire is connected to the positive pole, and the black wire is connected to the negative pole. When using, make sure that the positive and negative wires of the device correspond to the positive and negative wires of the adapter. 3、Safe Fuse: The battery adapter is equipped with a fuse to prevent excessive transient currents from damaging the battery and the device. It can be used with confidence. 4、Comes with Terminal: The adapter is equipped with terminal blocks to facilitate you to connect the device power cable to the adapter power cable faster and better. 5、Multiple Scenarios: The adapter can be used for remote control toys, robots, DIY and so on. The maximum allowable current is 20A and very practical and sturdy.