I followed the directions exactly, my Mighty Jump Pro was fully charged, and my vehicle’s battery was not completely dead, but this device did not charge my battery. My vehicle and battery are fine...a door was not completely closed, and the lights drained my battery. I bought six of these things and out of the two that we have used on a vehicle, both failed to do what they were supposed to do.
Bottom Line: No, I would not recommend this to a friend
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