To maintain their small size, the battery can only be so large, meaning you're not going to get more than a few hours of listening time out of them. (businessinsider.my)
These wireless headphones charge in a pocket - sized charging case, automatically connect to your Android phone and offer up to 24 hours of listening time on a single charge. (bgr.com)
There's also a «Fast Fuel» mode that gives you three hours of listening time with only a 10 - minute charge. (funkykit.com)