Howdy from Texas - I'm fixn to go on my first elk hunt in Colorado. Unfortunately, there are 4 - 5 bars of cell coverage on both my phones where I'll be. (as we say down here: "two is one and one is none.") This means I'll be tending to work. It is what it is...
I bought one of those Solar Joos Orange chargers because it has a built in 5400 mAh batteries built in. I also have a 6000 mAh Mophie, too. My plan is to use the Solar to fill up the Mophie and the Joos' own battery, then charge out all my phones and lights. Many of the reviews of the Solar Joos say that it can take a beating and still do its job.
I'll report back....