Guides
Four brand names that surface in almost every power station search. And one question that has no answer as asked: which brand is best? Each of these four sells units from under 300 watt-hours to over five kilowatt-hours, from a camping battery to a whole-house backup. A brand is not a product class.
Jonas Keller
Guides
Two numbers with the same prefix decide this purchase, and they do not measure the same thing. 100 watts is a rate: how fast energy flows. 100 watt-hours is a reservoir: how much is in there at all. Treat one as the other and you end up with a device that charges too slowly — or one that is not...
Sophie Ahrend
Guides
Nobody stands at the gate with a calculator. Yet one piece of arithmetic decides whether your power bank flies: aviation does not care about milliamp-hours, it cares about watt-hours. The packaging almost always prints the first number and almost never the second.
Sophie Ahrend
Guides
As of 5 March 2026. The box of a jump starter power bank almost always carries one very large number: 1,500 A, 2,000 A, sometimes 8,000 A on the cheaper listings. Next to it sits a second large number, the capacity in milliamp-hours. Those two figures are what shop filters sort by — and both say...
David Reinhardt
Guides
Three German institutions come up whenever somebody searches for a power bank test winner: Stiftung Warentest, heise online and the ADAC. They did not measure the same thing. They did not even measure the same class of device. And one of them never tested a power bank at all.
Jonas Keller
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