Matthew Niedermiller wrote a review of Powertraveller Powermonkey Extreme Portable Charger - 12V on May 9, 2014
Familiarity: I've put it through the wringer
I absolutely love this solar charger. I am carrying my iPhone, Go Pro, & speakers in the backcountry. I just strap the solar panel to my pack and stick the battery in my lid and let it charge all day while I am on the move. The panel can handle rain and the battery is waterproof. The battery has a large capacity in a small packaging which is unusually in the solar charging world. I usually get about 4-6 iPhone charges out of a full battery. You can also charge 2 devices at the same time. I usually plug in my phone and what ever else I want to charge when I go to bed and when I wake up everything is charged up for the day. I absolutely love this piece of gear. I take it with me everywhere I go.