Author: Ethan Caldwell

Ethan Caldwell is GeekBlog's resident Apple specialist, covering the entire Apple ecosystem: iPhone, iPad, Mac, Apple Watch, AirPods and the software that ties them together. A longtime iOS user and gadget collector, Ethan tracks Cupertino's every move, breaking down Apple keynotes, A- and M-series chip benchmarks, iOS feature updates and the rumor mill into clear, practical takes that help readers decide whether the latest Apple hardware is worth the upgrade.

Power bank specifications are unusually honest about the wrong things. The capacity printed in giant numbers on the front is real, and you will never get it. The wattage is real, and it often is not available on the port you are using. Learning to read these claims is worth more than any ranking, because it tells you which of two similar looking packs will actually do the job. Quick answerExpect about 70 to 75 percent of the printed capacity to reach your device, because converting voltage costs energy as heat. Check whether the headline wattage is per port or…

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