So much talk about "max safe voltage"...it is important to remember that this is a variable number!
This is why temp-regulated charging is important. I regularly saw 30+V charging GEL batteries (24V system) in cold temps on OceanPlanet. That's right...GEL. That set of Geltechs made it twice around the world and were still working after 6 years and about 75,000nm. Of course when it was hot the charging voltage was much lower!
The "dumb" regulators are fine if the operating battery
temps are not too cold or too hot. For charging in the hot tropics with the batteries in the engine
room, if the regulator
doesn't pull back the max voltage then you WILL gas them. If it's really cold and you consistently charge at only 14.1V you may not get a truly fast/full charge and could start to sulfate the plates.