The worst is planning a short trip out and then realizing that your phone is out of juice. You didn’t bring your backpack so you don’t have your big charger or cables. What if you could carry reserve juice in your wallet? That’s where the TravelCard ($40) comes in. It’s a battery backup the size of a credit card and just 3/16″ thick you can carry in your wallet. It gives you five hours of talk time, 4.5 hours of internet usage, and 98 hours of standby time. There are four colors available and it comes with either a micro USB or Lightning connector. You can check out their Kickstarter campaign which is going on right now.