LiTime 12V 40A DC-DC Battery Charger with MPPT Solar Controller, Dual Input Smart Charger for 14.6V LiFePO4 Lithium Batteries, Fast Charging for RVs, Campers, Trailers, Solar, Home Backup and Off-Grid

https://a.co/d/0eqoc4pw I think it beeps when reverse charging though. Probably better off just installing a switch or a relay with a standard DC to DC and removing the key off load from your starter batteries.