Best for Any Situation
Anker Astro E4
If you’re looking for an all-around performer, Anker’s E4 fits the bill. It combines the features you need — 13,000 mAh to charge an iPhone about six times; 2.1 amp output so it can handle tablets as well as phones; and dual ports so you can charge two devices at once — in a slim 5.9×2.5×0.9-inch form that easily stashes away in your bag. Charge it up, throw it in, and forget about until you need to re-up. [$36; ianker.com]
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