The harness comes along with an inline fuse pre-installed. Get hold of us if you are searching for a Supra Adapter to connect with the inventory battery harness (2023 design Sur-Ron and before only). The BtrPower 72V Ebike Battery delivers sturdy efficiency for motors ranging from 1800W to 2500W. https://sur-ron-battery-72v39305.blogitright.com/37869588/about-sur-ron-ultra-bee-weight