Photo: Gregor Halenda

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Power Is Knowledge
Powerstation Plus
Take your work outdoors with this innovative charger that keeps an Apple or micro-USB tablet (and one other similar device) juiced for up to nine hours. It also shows battery life and charging status, so it'll never shut down while you're scrolling through your feed—er, studying for exams. 
  • Originally $80, now 20 percent off with code oprah

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