One mayor plus about this powerbank is its capacity, and for people who are not familiar with mAh (milli-Ampere-hours) let me start by telling you that the iPhone 6 plus uses 2,915mAh and this powerbank has a capacity of 20,000 mAh, that's right! It can charge almost 7 times the iPhone 6 plus.
With 20000mAh capacity this power bank it's one of the meanest (In a good way) and badass (also in a good way) device that I've ever had the pleasure to have. It can charge my iPhone 6 Pluse 5 times and still be at half capacity. I say 5 times because really I can't run out of battery as fast as this power bak recharge it again! It's heavier and bulky than your average powerbank but it's nothing compared to the peace of mind you can have while you have it with you.
It has 2 usb ports. One is standard 1.0A and the other one is 2.5A (great for iPad or iPhone faster charging) Also the middle button on the device is to turn on an LED Flash Light that you'll find it usefull when being at trains or airplanes for a quick light to help you out. It comes in a cool black and red color, and light blue and white option is also available. I defenitly recommend buying this improved Poweradd Pilot X7 Power Bank and you would never feel without power anymore.
Pros:
20,000 mAh (Lots of power) Price $21.99 Is a steal for the amount of power you're getting LED Flash Light is also useful Tough design. Build to lastCons:
More bulk than your average powerbank. Charging takes longer due to it's big capacity Great for carrying it on a backpack but not so good as for carrying it on you.Rate 9/10
Buy it here: https://www.amazon.com/gp/product/B0157RHV8O/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1