A backup battery that can recharge your phone more than 7 times over should be enough for most trips. But the ZeroLemon SolarJuice adds solar power, water resistance and shock proofing for good measure. Right now, it's 50% off for io9 readers.

That monstrous capacity can be used to charge tablets and laptops, too, and the electricity is held in a polymer battery, which cannot overheat. Power is doled out via dual USB ports, providing 2.1A and 1A respectively — the faster of the two is about as quick as most iOS and Android devices can suck up the juice. Extra top-up power is provided by the solar panels that cover one side of the ZeroLemon, with eight hours of sunlight being enough to half-fill the internal battery.

>> Get 50% off the ZeroLemon SolarJuice 20,000mAh ($49.99 incl. shipping)

Here are the SolarJuice's features and specs…

  • 20,000mAh Lithium Polymer battery, with a life of 1000+ recharge cycles
  • Anti-explosion, lightweight, compact, and reliable
  • Recharging capabilities via powerful 1.2W monocrystalline solar panel
  • 4 LED indicators show charging progress
  • Dual outputs at 2.1A and 1A for maximum iOS and Android charge rates
  • Ultrabright LED flashlight

Shipping is free (but only available to the Continental US), and ZeroLemon's 180-day guarantee is included. See the link for a closer look.

>> Get 50% off the ZeroLemon SolarJuice 20,000mAh ($49.99 incl. shipping)


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