I really like the creative idea about hooking up the touchstone in a vehicle. I may do this myself for time being but I am looking to take advantage of the Energizer Energi to go Solar devices (or similar tech) in the future. My idea is to wait and see if the SP1000 or SP2000 or compatible alternative charging solution could be taken advantage of in my vehicle since it sits out in the sun 8 - 9 hours/day and can even charge using interior light at a much slower rate. Perhaps I might be able to hook the touchstone up to the solar cell. Just wondering if anyone else has some other ideas like this.