The top model (24V) was purchased for just under $600. Arrived without damage. Plugged in, tried 3 different batteries, 2 in the car, one outside. With the NOCO Genius G15000, everything charges perfectly, so there are no problems with the batteries. Schumacher starts charging, increases the current, and after a few seconds the internal relay clicks madly and the display goes blank. What a mess. Schumacher: Fix your quality or you die. I have a similar sized Schumacher block that is over 20…