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Smartphones, tablets, cameras, headphones, portable speakers and even notebooks: More and more devices can be conveniently charged via the uniform USB connection. No wonder that external USB batteries (aka power banks) are becoming increasingly popular and can now be found in almost every household.

We have been testing external USB batteries and USB chargers regularly since 2013, since 2017 under the flag of

Below you will find various rankings for USB batteries, USB chargers and soon a knowledge database, which, for example, clarify the question of why the advertised capacity of the batteries often does not match practical experience (a 10,000 mAh power bank charges a smartphone with 3,300 mAh battery not 3x) - and the manufacturer still doesn't cheat.

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