RAVPower 16000mAh External battery pack 4.5A USB Charger for Smartphones and Tablets, Black (Electronics)
So, after a few months use I'll write what I experience as the RAYPower 14000th Unit has been performing flawlessly. Use it a lot because I travel a lot. Device can be charged easily at any USB port, even on "weaker" (with, for example, only 500