No power outlet? No problem thanks to the ultra portable, ultra lightweight Switch 8 Recharger ($27) by Goal Zero. Crafted from titanium, the Switch 8 is outfitted with an 8-watt, 2,200mAh lithium ion battery, a USB port, and several different charging caps that render it capable of charging multiple devices at once, or one device to near 90% of its capacity. Once your phone is charged, recharge the Switch 8 via USB or by using the included solar panel.
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