I bought this because the 12V charger that came with my kit overcharged & cooked the 2 original batteries, which no longer would hold a charge at all. I had the batteries rebuilt with larger 2500ah cells. The batteries have 3 terminals, as does the charger, but it will not fast charge; I have to leave them in the unit for days with the red light flashing "soft start" but eventually they do charge, so I'm wondering if anyone else is familiar with this issue or it's solution. Thanks in advance