Goal Zero Switch 8 Solar Recharging Kit has sunlight collectors the size of an open novel. It stores the energy in a detachable cylindrical battery pack that connects to your phone. (Kirk McKoy / Los Angeles Times)
The Goal Zero Guide 10 Plus Adventure Kit is more powerful than the Switch 8. The Guide 10 has larger solar panels that store energy in a detachable AA battery pack. (Kirk McKoy / Los Angeles Times)
The tiny Plug battery charger by Molla Space connects directly into the cellphone. In our tests, it boosted the battery from 1% to 20% in 30 minutes. (Kirk McKoy / Los Angeles Times)
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The Eton BoostTurbine2000 has a hand-crank that can charge a phone — with some work. (Kirk McKoy / Los Angeles Times)
The nPower Peg is a kinetic charger with an internal weight that moves up and down with movement, energy that is captured and stored for use powering a cellphone. Again, novel but more work than some users might have bargained for. (Kirk McKoy / Los Angeles Times)
Our writer’s favorite: the Mophie Juice Pack Air, which wraps around an iPhone much like a traditional case. (Kirk McKoy / Los Angeles Times)
The eFreesia Bar charged a dead iPhone battery to 85% in our test. (Kirk McKoy / Los Angeles Times)
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The growing number of options for recharging your phone, without access to a power outlet, can be overwhelming. For more pros and cons of these devices, read Alissa Walker’s full review. (Kirk McKoy / Los Angeles Times)