I have a HF toaster, but don"t use it after buying a Midtronics Advanced Battery, Starter & Charging Tester BPT300 battery conductivity tester.
Conductivity testers are the next generation in giving you real data on a batteries condition. I got mine on ebay.
I too have many batteries and like to know their condition. I also have a batteryminder #12248 that will charge, desulfate, and float charge. When it gets to the float mode, I move it to another battery. I"ve found charging 2 or 3 batteries at a time does a better job of desulfating.