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 headphones while traveling or give your Apple Watch a quick energy boost if it's nearing shutdown. And if your iPhone starts running out of battery — because it inevitably will — you can even use your iPad (if you have one) to breathe extra life into it. Or, you know, just juice it up the old-fashioned way via your Mac, a wall outlet, a wireless charger, a snap-on battery pack, or even your iPad. To avoid completely draining your iPhone's battery for the rest of the day, here's everything you need to...more
