Among the 10,000 mAh power banks, a Varta model with wireless charging wins the test, while Xiaomi convinces with high performance and short charging time among the 20,000 mAh power banks. If you want to buy a really powerful power bank, it's best to go for the Anker 737 - it charges in record time, but is quite expensive...

When your mobile phone runs out of power on the road, they promise to save you. But the powerbank test shows: They don't always deliver as much energy as they say they do. We tested 19 power banks between 10 and 100 euros. The practical test confirms this: All of them can charge smartphones and tablets as well as laptops - as long as they support USB-C charging...