Tips
Almost every MagSafe power bank listing prints the number 25 watts somewhere. It is a real number. It just belongs to the puck on the wall socket, not to the battery, and even there plenty of iPhones never reach it.
Sophie Ahrend
News
Anyone who bought a balcony solar device two years ago heard the same line from the electrician: not without a special energy socket. That reason is gone since December 2025, settling the Schuko vs Wieland question.
Jonas Keller
News
Search for a power station test this summer and Stiftung Warentest comes up almost every time. The page looks current, mentioning January's Berlin blackout, but nothing on it has been measured in three years.
David Reinhardt
News
A power bank rated between 100 Wh and 160 Wh is still allowed on board today, provided your airline signs off on it first. That approval route is exactly what IATA is deleting on 1 January 2027. From then on, 100 Wh becomes a hard ceiling for passenger power banks.
Jonas Keller
Guides
There is one big number on the box: 1,024 Wh, 2,048 Wh, 3,840 Wh. Almost every buying guide online turns it into the same calculation — capacity divided by appliance wattage equals hours. That calculation is convenient, it is memorable, and it falls apart in exactly the cases where it matters:...
David Reinhardt
News
As of 10 June 2026. This page lists every power bank recall from October 2024 onwards and keeps two things apart that most coverage merges: the recalls that reach the German market, and the ones that only ever applied in the US. It is reviewed monthly.
David Reinhardt
Guides
Every product page for a balcony solar battery shows the same chart: one bar for yield without a battery, a taller bar with one, and a payback figure underneath. What almost never appears next to it is the set of input values that produced that figure. And the inputs are the entire difference...
Sophie Ahrend
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
News
New worldwide rules for power banks on aircraft took effect on 27 March 2026, published by the International Civil Aviation Organization as an addendum to its Technical Instructions. Most of the coverage that followed carries the same mistake: it turns a recommendation into a ban.
David Reinhardt
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
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