Bluetooth headphones tested - headphones with good sound and rechargeable battery

New in Stiftung Warentest's constantly updated headphone comparison: 12 current Bluetooth headphones. Among them are devices from Adidas, JBL, Nothing and Teufel. The headphones from Adidas have a solar cell in the earpiece, the supplier advertises with "light instead of socket". We tested charging via light and socket - the socket wins. The solar panel extends the battery life in the best case. It charges fastest in direct sunlight, but 37 minutes of sunlight only adds one per cent to the battery. Note: In the table, we show the battery life for classic charging via USB.