I put my Schumacher sc2500a into storage today.
It too will do mid 16's, even on the AGM setting, and it won't go there slowly either, but blow right past the mid 14's and pump 15+ amps into a single battery at 16.4v, which is quite abusive in my opinion.
I had to monitor that charger like a hawk, or come back and find ridiculous currents being pumped into the gurgling spitting battery. 1 time out of 5.
If we are just seeking maximum voltage as some sort of urinating contest, my MeanWell rsp-500-15 will do 19.23v at well over 30 amps.
A useless feature for battery charging, but for a urination contest, quite the battle ax.