When I got this unit I hooked it up to my truck battery in my garage that evening, turned it on and let it charge all night. When I got up the next morning and checked, the device was completely off. When I pressed the mode button it turned back on and started charging again. The last green light didn't show that it hadn't charged overnight and was off. I sent it back and ordered a more powerful CTEK PRO25SE model and it works great and fully charges my battery. I also have another CTEK PRO25SE (their top model) for my Class C motorhome and it works great too. I ONLY recommend the more expensive CTEK PRO25SE. It costs extra money.
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