I used the charger to start a friends vehicle. I hadn't recharged my device for much time but it was still fully charged and capable of easily starting his car. My buddies were amazed at how this small unit could start a car with a dead battery and frankly so was I since this was the first time I had used it since I purchased it.
very nicely packed. works very well, nice plastic, good grip in car (air vent). One can use only password or pattern to unlock the phone, if sensor is in the back, but that' s not a real problem. I don't know about fast charging, yet. I did buy a fast auto charger to use together with this one. I would recommend this product.