Logitech doesn't make the UE Hyperboom very serviceable. I believe the battery part number you're looking for is 533-000170, however, this is not available for purchase from what I can tell.
You may be able to take the battery out and replace the actual individual cells but this is a dangerous repair. If you're interested in looking into that type of repair you can ask for guidance on [link|https://www.reddit.com/r/18650masterrace/|Reddit|new_window=true] from qualified experts.