Thank you for supporting our product. 

No, the Nebula P1i does not have a built-in battery and requires a power source to operate. A built-in battery would increase the device's size and thermal load, potentially affecting performance stability while also limiting weight reduction.

If you require outdoor use, you can pair it with a portable power bank for power supply.

The D2200 requires an adapter for use, so we recommend pairing it with Anker Solix products. The C300 and C1000 provide 3 hours and 10 hours of battery life respectively.

If the above solutions cannot solve your issue, please contact Nebula Customer Support at service@soundcore.com  for further assistance.