Can't believe this hasn't been posted here, (I searched for "chargecard" and came back with no results). This looks pretty promising and fairly inexpensive too. I wonder a couple things about it though. Given how small it is, I wonder how much secondary power it actually provides for an iPhone 5. Secondly, I wonder how long it will hold a viable charge for. The allure of this product to me is that you could charge it and just leave it in your wallet just in case. My problem with that is that I very rarely drain my battery in a day. Guaranteed the one time I actually need it I will have forgotten about it in my wallet for weeks and it would be dead.
http://www.chargecardproject.com/
http://www.chargecardproject.com/
