Image: Foundry It happens to all of us: you’re out and about and your iPhone is running low on power. You can’t wait to get home–you need to charge it as soon as possible. Or maybe you’re getting ready to board a plane and want to top off your iPhone’s battery. At many locations (stores, airports, amusement parks, etc.), you’ll find public charging stations where you can plug in (often for free) and get some juice for your iPhone’s battery. Using public charging stations, however,...