We store our batteries in the garage during the winter, and once a mont, or so, I'll put them on desulfate cycle for 24 hours.
The charger is a "Power on Board" brand and called "Smart Charger". I picked it up at either Costco or Sam's Club a couple of years ago..
The issue is that it is almost impossible to listen to any AM broadcast in the house or near the garage when the charger is operating in desulfate mode.
I understand that in this mode the charger sends high frequency high voltage signals to the battery, and I wondered if anybody else has experienced this problem with other, so called, smart chargers when in desulfate mode?