I looked at these power banks, but when I back country bicycle tour in remote areas for several days at a time, where electricity is difficult to find, I found out I often use around 20,000 mAh over 2-3 days. charging my phone, bike computer, lights, Zoleo, and other electrical devices I carry. I would have to carry 4 of these light/power banks to meet my needs.
This being stated, I am always looking out for higher powered power banks that work well for bicycling.