JBL says these should get you up to 16-hours of battery life and also have high speed charging.

There are headphones aimed at just about every user out there and the JBL UA Sport Wireless Train are no different. These headphones are aimed directly at those who spend a lot of time in the gym. Unfortunately, I am not one of those people. Still, the company sent the JBL UA Sport Wireless Train to me for review. While I can’t speak too much to intensive workouts, I can sure speak to sound, design, and a variety of other factors.
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https://techaeris.com/2018/07/29/jbl-ua-sport-wireless-train-review/