I think of chargers as being high in ripple merely to save money (since they don't need smooth dc). After all, a battery usually behaves like a capacitor (it filters out ac).
And yes - pulsing is used to de-sulfate plates etc. (But they wouldn't give us something for nothing LOL! - not with all these wanker 2300mA, 3200mA, 4500mA variants ...)