I believe it will still charge at the higher voltages, my impression was the RVC sensor tells the computer how much juice you are using to generate just enough juice to keep from charging your battery as often/much? Will be disconnecting mine. Keeping an eye on voltages and battery SOC in the Tech2.. Had seen as low as 70% SOC before.
so this is very very general and changes based on all kinds of things, but
The bulk charge voltage of a 12V AGM lead acid battery is typically 14.7 volts, and the float charge is typically 13.8 volts.
so when you say run the radio for a bit and then crank the truck, you need to replace what was used at the bulk charge voltage of 14.7 but once charged it will bake the battery if you keep the voltage at 14.7. but you also can't run your alt at 13.8 as it will never fully charge at that voltage and you'll run around at 70% soc which isn't good for long lift either.
now the hotter or colder the internal Temps, those voltages change and at what point the steps change.
it's one of those things that probably doesn't matter much in real use for most people. if you put one in and it lasts 5 years, no biggie that's all the lead/acid would probably do anyways, but if it doesn't, it's probably because it's over or under charged by your system that isn't adjusted right.