I bought this charger because I have a truck that doesn't get that much use and after 2 months idling in the cold the battery was almost dead . One evening I plugged in the charger and by morning the battery was fully charged. On the other hand, I accidentally left the interior light on in my car and when I plugged in the charger, after several attempts, there was only an error. As it turns out, the battery may be too weak to run the charger. This battery was new in August 2019. I called Triple A and their charger didn't work either. When they plugged it in to get on their truck, it ignited instantly. After just one minute, the charger recognized the battery and started charging. It was fully charged the next morning. Just and FYI for those who may have the same issue.
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