I have had my Powercore 20100 for a while now, and am actually charging my phone right now with it!
But that’s not the point.
It has a 20100 mAh battery, which charges my iPhone 6 around 4-6 times before needing to be recharged. It lasts me all week, so I don’t really need to worry about not having power if I don’t plug it in overnight. When you do charge it, it takes around 6 hours to charge fully.
It also has Anker’s patented power IQ technology, which scans your device and delivers the fastest charge (safely) as possible. For anyone with the qualcomm quick charge technology on their devices, it also has that included in the charger.
The build quality of it is phenomenal. Mine specifically has taken many hard falls and only comes out with a little scratch. Compared to other batteries I have previously had, I was expecting it to fall apart/explode. It also can’t help that they include a little drawstring carrying pouch for a little extra security.