A:Answer Hi, there.
Thank you for your question. You are absolutely correct that the SoundLink Revolve uses a built-in, rechargeable lithium-ion battery. If you were to experience any difficulty with the battery, we would be happy to assist you with troubleshooting. If service is needed, this would be either a repair or replacement of the speaker itself.
Please don't hesitate to reach out to our support team at 1-800-367-4008 if you have any other questions. They are available M-F 9 AM to 9 PM Eastern. Thank you, and have a great day!
Jesse - Bose Support