Goal Zero Switch 8 Recharger Charge your GoPro once or twice.
Goal Zero Sherpa 50 Recharger
Goal Zero Sherpa 50 Solar Recharging Kit with Nomad 13 Solar Panel Charge your GoPro 9 times, or forever when you run the solar panel.
Goal Zero Yeti 150 Portable Power Station, 150Wh Small Generator Alternative with 12V, AC and USB Outputs 25 GoPro charges - this is what I run deep of the grid for professional video documentary film shoots.
GoPro HERO4 Silver