Another thing I observed, is that my smart charger does not fully charge the batteries. I am guessing it charges to 95-97% SOC, because when I float charge with my old Magnatec 950 constant converter/charger at 13.6v for a few days after the smart charger says full, I can dry camp for a few more days without generator recharge. I have no way of quantifying this, but I think that this automatic charging to 97% or so when you keep your MH plugged in, builds up sulfate over time because the batteries never see 100% SOC. I don't know if anyone else on here has observed this or read anything about it.