I wanted to let you all know about a little product that I have been using since February and love. It is a super lightweight ( pack of gum ) small back up charger for the iphone, this one is for the 4, but they have them for all iPhones. It gives you an additional 3 hours of talk time. This is not something to travel a long time with because it only charges one time and then you need to recharge the back up itself. I think that it is only 1200 mAmps. But it is fantastic for hiking, biking, or just being away from a charger all day. It has been so useful at my day long doctor's appointments. ( I also have a 15,000 mAmp multi port back up for everything from computers, to Kindles, to DSs, for when we travel long distances without access to power...trains, planes, automobiles ).

Anyway, just wanted to share something that has been uber useful to me.

http://www.givesimple.com/portable-back-up-battery

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