I find the IGo charger handy for out and about since you can charge the charger so that if you need to charge a reader, ipod etc. , you can charge it without plugging it in. It will charge it once which should be enough if you need it on a camping trip.
I think this is the one I have:
http://www.igo.com/mobile-chargers/c...t/ps002730001/
Jodi