Tips
Most power banks already carry the answer on the casing. Turn the thing over and look for a line reading `74Wh` or `Rated Energy`. Manufacturers print it because aviation rules are written in watt-hours rather than milliamp-hours, not out of generosity. If you're trying to convert mAh to Wh and...
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
News
On the morning of 3 January 2026, a cable bridge over the Teltowkanal in south-west Berlin caught fire. Five 110 kV high-voltage cables and ten 10 kV medium-voltage cables were damaged beyond repair. What followed was, in the Berlin Senate's own description, the city's longest power outage since...
Sophie Ahrend
News
Batteries burning in aircraft cabins, tightened hand-luggage rules, recalls still running on individual models: anyone following power bank news over the past few months has mostly been reading warnings. Against that backdrop, the headline finding of the new test from Stiftung Warentest —...
Jonas Keller
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