Power Your iPhone 4/4S with The Sun

There are times where you absolutely need to charge up your iPhone 4 or 4S, but you’re nowhere near a power outlet. In those situations, you might fall back upon an iPhone battery case like the trusty Mophie Juice Pack Air I carry with me, but what happens when that battery runs out? No problem, as long as you’re carrying the Etón Mobius (US$80) rechargeable battery case with a solar panel and it’s a sunny day.