The battery is chargeable. My first pair had a bad battery, but Plantronics was fantastic and shipped out a replacement pair immediately. The new pair has a very long lasting battery. I use them all week for 4-6 workouts, often very long ones, and they never even get low on the battery. I've charged them on weekends for maintenance so they're ready to go, but never had to do it out of necessity. They charge very quickly, so the battery is ready to go.