This is a typical charge chart using a good 'SMART MODE' CONVERTER/CHARGER' unit...
You can verify this by using a 12VDC Multimeter across the battery terminals while being charged...
Google image...
When I got my NEW 2008 StarCraft 14RT back in 2009 my installed ELIXIR Industries Converter/charger unit only produced 13.6VDC and boiled out my battery fluids.
I replaced this unit with a Progressive Dynamic PD9260C 60 Amp SMART MODE Converter Charger unit that would automatically go into the modes shown on the charge chart...
An inexpensive 12VDC multimeter will tell your story connected to the battery terminals when charging...
I wanted to do OFF-ROAD camping which would require multiple 12V batteries so I really needed to purchase a higher amperage charge setup anyway...
Roy Ken