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My power banks have to work hard, which is why I recommend buying these charging devices from reputable brands. I work to keep those brands honest by extensively testing dozens of products every year using an array of gadgets to make sure they do what they say they do on the box. I test capacity and power output, water resistance if applicable, and durability.

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I've rigorously tested hundreds of portable chargers in recent years, putting me in the perfect position to identify which ones truly deserve your money. Testing a power bank involves power meters to measure capacity and power output, testing durability claims in real-world tests, followed by a chunk of time using the item on a day-to-day basis. At the end of this, I know just how good a particular power bank is.