For some people, an external battery pack provides comfort during a power outage. For others, it's a necessity, a way to avoid being alone once the sun sets.
Either way, don't spend your money on a charger that can only re-power your phone once before blowing its load. Instead, wait for a deal online and get something that can go five times as long. Right now you can get the KMASHI 15000mAh battery back on Amazon for $15.99. That's not lower than what we've seen before, but with the coupon code M6UP4WVR, it can be. Those characters bring the price down to just $12.50.
This power bank comes with two USB ports (5V / 2A and 5V / 1A) so you can plug in multiple devices at once. It doesn't have an LCD screen like some of the other options, but four LED lights on the side will give you a rough estimate of how much longer the experience will last. As for colors, you get black and red. Whatever your preferences, your phone is bound to be turned on.