There are hundreds of external battery packs out there, and most of them are highly similar to one another: cosmetics aside, their capacities, features, and pricing tend to be predictable. Anker’s 2nd Gen Astro E7 ($80) is a complete outlier. It has the highest capacity of any external battery pack I’ve ever tested, yet it’s priced competitively with¬†products that deliver half as much juice.

If you have an iPad or plan to carry your iPhone around without access to wall power, Astro E7 is as close to a must-have battery as I’ve seen. Delivered in efficiently designed, eco-friendly packaging, it quickly earned a place in my personal travel bag, for¬†reasons I’ll explain below.

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