You're probably walking around with a portable power bank in your pocket and don't even realize it. Yes, that iPhone of yours doubles as a quick-charge station for all your other pocket-sized gadgets. But it's important to understand precisely how this feature works, including its limitations, the devices you can charge, and how effectively it does the job. Now, you won't get blazing-fast quick-charge speeds with your compact iPhone power station, but it's more than enough to revive dead head...
