Many reviews say it doesn't work. Mine works great. But then it didn't happen. Here's what I did: I connected my extra lawnmower battery to the bank. Fully charged and everything is fine. I connected the battery to the tractor in my mower and it clicked and gave an error message. I changed the batteries and tried again, still errors. As a result, I unplugged the device (from a 120V outlet) and then plugged it back in. It worked. Nothing came from the connected battery. I strongly believe this cheap low amp box is only intended to be connected to a battery and not a vehicle/lawn mower. If errors occur, unplug it from the wall and let it restart. Since then no problems. If you don't know what you're doing, stop leaving bad reviews. It's only bad for others. Some of us can weed out idiots, but just stop.
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