I streamed slacker, got emails, txts, and nav on an 11 hour trip yesturday, and started at 85% and was a full charge within 30ish minutes, and then kept it at 100% for the rest of the trip. This was with screen at full brightness as well. And incase anyone is interested, temp never got over 96 degrees in a windshield mount! Most of my other phones would have gotten hot enough to shut down on this trip. I am very happy with this!