Its conference season and the same two things happen to me at EVERY conference.. First; at some point, the wifi will go down and normally JUST as I need it which makes iphone tethering a MUST and Second; my iphone will run out of battery.
I solve this by carring an extra battery... when I remember to take it with me... and remember to charge it. I know I can get a battery case, but they make the phone too big for me. So I got my hands on the sun-plugged iphone battery case and decided to give it a try. Its not dramatically smaller then any other case I have seen, but it crosses that line where it feels like a normal iphone case. And that makes a differnece. I used it all day and night during web 2.0 and I think I took it down only 50% and the iphone was still fully powered. Pretty good. Its $60 so pretty typical in price. I now have a new case for my iphone and no longer need to worry about remembering to take (much less keep charged) my spare battery.

Mophie?
Looks identical to the Mophie Juicepack. Had one for a year, then it just became a thick case. 8(
Did it die out slowly or just
Did it die out slowly or just one day up and quit? All batties die at some point; but a year? Hmm... If you would have said two years, I think I would have said that given the constant charge and discharge for a small battey would make sense, but not sure about a year.
Did it die out slowly or just
Did it die out slowly or just one day up and quit? All batties die at some point; but a year?