3 Lithium Polymer batteries required.

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[True Wireless Stereo Plus Technology] Adopting the high quality Bluetooth 5.0 chip, these wireless headphones for running ensure more stable connection, no long worry about the problem of disconnection after the phone is put into the pocket.Gives you high quality sound for listening and conversations, Experience music, movies, podcasts, calls, and more in a whole new way.
[30H Ultra Long Playtime] This earbuds offer up to 6 hours of use on a single charge – long enough to power you through almost any workout.Check the Earbuds’ Battery on the phone top right corner of your device’s screen. What’s more, the portable charging case build in 650mAh battery will provide extra 24 hours of battery life to keep them ready to go again for all-day uninterrupted music.