If you own a smartphone, you have had power anxiety: Will you make it through the day? Did you remember to bring a charging cable? The ChargeCard from BiteMyApple can help; it is an Android and iPhone (4&5) charger that fits in your wallet. It is a tiny bit thicker than a regular credit card but it handily fits in even the thinnest billfolds. One end plugs into your phone’s power port and the other goes into a USB outlet. May new cars have USB ports for power and so do computers, but if you want to plug into a socket, you’ll need a USB AC adapter.