Yeah, they've saved my highly overheated butt on more than one occasion.The American Bonanza society tent has a free charging station .
Many people stop in for a cool drink, pop corn and to sit down in the shade.
My practice has always been to carry at least two batteries for my cell phone. Charge them both at night before bed and then you're good for a couple of days.Both those are cool! I was worried about having to sit around my phone for an hour waiting for it to charge.