This charger should plug into the OEM port. It might require some clipping of the port to remove a plastic leg.

https://www.amazon.com/HTRC-Charger-36V18Amp-48V13Amp-Lead-Acid/dp/B0BKZ2R94T/?_encoding=UTF8&pd_rd_w=JJAS3&content-id=amzn1.sym.bc5f3394-3b4c-4031-8ac0-18107ac75816&pf_rd_p=bc5f3394-3b4c-4031-8ac0-18107ac75816&pf_rd_r=GZH88GD57YK51GRA1V7K&pd_rd_wg=JlU8t&pd_rd_r=662304ae-f72c-4ee8-b0c0-afd745877af2&ref_=pd_gw_ci_mcx_mr_hp_atf_m