I have "chargers", and I have a "converter" in my RV. The converter is more like a high-current power supply, which is wired across the battery, it supplies the loads, but doesn't do a great job of recharging the battery. It is set to ~13.6V, which is a reasonable "float" voltage for SLAs, but is too high to float flooded-cell batteries, and is too low to re-charge them in minimum time. So it is not good for anything, except turning on the lights in RV when plugged into shore power.
My "chargers" implement a modern three-state charging algorithm; current limited while the battery terminal voltage is rising, then hold the battery at ~14.5V until the charging current drops to ~0.1A, and finally hold the voltage at ~13.1V during "floating".