Those with flooded batteries, and faith in their Automatic charging sources to fully charge a battery, well, Prove it can actually fully charge the battery.
Deplete the battery to 50%, and start your multistage charger, and when the charger shuts off or goes to float mode, dip the hydrometer.
I bet if 1.285 is the maximum baseline, most will find 1.270.
Do the same for a week, you'll find 1.260 maximum.
Anybody who monitors voltage during discharge, and starts a discharge at 1.260 is going to notice that voltage drops significantly more than it did when started at 1.285 on day one.
Someone with a Mega watt can hold Absorption voltage until SG maxes out, see that it took 4 hours 17 minutes and 36 seconds. And Next time crank the timer to 4:20.
Someone with AGMs and a Megawatt and an Ammeter can hold absorption voltage until amps needed to hold absorption voltage decrease to 0.5% of capacity. 3 hours and 52 minutes? whohoo spin that dial then next time and go drink a beer.
Someone with a 8 stage bells and whistle charger, has only Faith, and is likely easily reassured by blinking green lights, even though they are dimwitted liars, the green lights that is.