Don't see this one mentioned. This is a great powerbank, could charge a tablet multiple times, or charge your bike lights and a phone multiple times. I used this for multiple trips before the USB port broke (the small bit of plastic came off with the cable I had connected). Honostly, I treated this thing pretty roughly and often had the cable connected and wrapped around the device, or traveled with the cable connected and the powerbank stored, so I wasn't surprised when the plastics inside the USB port failed.

EasyAcc 20000mAh Dual USB Power Bank http://www.amazon.com/EasyAcc-20000mAh-Precise-External-Smartphones/dp/B00LHB51GO?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00