Might be a problem. Changing to AGMs is no problem, but Lithiums require a different rate. I would contact the MFR of you Converter and ask them the question, also the battery MFR for their input on charge rates.
I Jan we bought a new Golf Cart and the built-in charger is good for Flooded or AGMs, but if we wanted the Lithium option it would require a new charger.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top