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That article raises some interesting questions for me. I've always hooked positive to the battery and negative to a ground of the car somewhere without removing the negative cable from the battery. I then plugged in the charger. The article is a little vague about that when it says start the charger. My charger has an AGM setting, but I don't know if it would default to that with everything hooked up and then plugged in. Not sure either if that short time it would take me to switch from whatever it shows to AGM would create a problem. My trickle charger doesn't indicate if it's AGM. I'm going to have to check on that. one thing though seems to be definitive. My batteries were fine until I turned the ESC system off for a few hundred miles. When I switched it back on, they didn't have enough juice.
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