Well, you'll be leaving home without it, but I'm glad it works the way it's supposed to. For me, my 1 main/backup battery is always fully charged as the main power source for my 12v cargo trailer winch. Small but powerful. Minimal overnight charging, 24/7 battery maintenance when not in use. Already 3 months, unplugged and only used the battery 6 times, no problem. I recommend this to anyone who needs a reliable AC charger to service any size 12v battery.