This one matches Rad specs. 48V (54.6V peak or "float" voltage) 2A 13S (13 cells in series = nominal 48V):
https://www.amazon.com/DC-1Prong-5-5x2-1mm-Universal-Radrover-Interceptor/dp/B0753C35N8/ref=pd_bxgy_d_sccl_1/133-9484705-2351350?pd_rd_w=VTv1y&content-id=amzn1.sym.4e8180d8-1c12-4df8-af99-b6dc78fc0026&pf_rd_p=4e8180d8-1c12-4df8-af99-b6dc78fc0026&pf_rd_r=A4CB87TKTZVN9WH99QYA&pd_rd_wg=WvbbW&pd_rd_r=e87f863c-b5cc-4306-87dc-80037fab3830&pd_rd_i=B0753C35N8&psc=1
https://www.amazon.com/DC-1Prong-5-5x2-1mm-Universal-Radrover-Interceptor/dp/B0753C35N8/ref=pd_bxgy_d_sccl_1/133-9484705-2351350?pd_rd_w=VTv1y&content-id=amzn1.sym.4e8180d8-1c12-4df8-af99-b6dc78fc0026&pf_rd_p=4e8180d8-1c12-4df8-af99-b6dc78fc0026&pf_rd_r=A4CB87TKTZVN9WH99QYA&pd_rd_wg=WvbbW&pd_rd_r=e87f863c-b5cc-4306-87dc-80037fab3830&pd_rd_i=B0753C35N8&psc=1