LimeFuel 15,000 mAh Portable Battery & Flashlight
I actually have about 10 portable chargers, as they're somewhat addicting and great for giving away as gifts. The Limefuel Lite LP15ox 15,000 mAh battery can charge two devices at once, has a small LCD display that gives actual battery percentage readings, not just a few LED lights, so it's more accurate, and my favorite aspect is there's also a small flashlight built in.
It has grade-A cells that last long and live up to the 15,000 mAh rating, charges two devices (only one at 2.4 amp output) and the flashlight is great for camping. It's actually in my camping bag, and not what I use daily. They have a button to turn it on to start charging, and it automatically turns off when your device is full. It's pretty small and portable, and costs $34.99. They actually have a bigger 20,000 option for $29, but it's not quite as portable.