Review on 🔊 Enhance Your Audio Experience Anywhere with Skywin Wireless Battery Speaker - A Portable Powerhouse for Superior Sound by Raymond Doe

It worked fine at first, but the battery doesn't last. If you pull off the gray rubber ring on the bottom and unscrew the four screws, you will find the battery pack. It looks like a pretty standard dual battery pack with two 18650 cells outputting 7.4V. This one seems to be a good replacement: https://smile.amazon.com/EBL-Rechargeable-Batteries-Replacement-Electronics/dp/B087BYJ51T/ Note that you may need to reverse the polarity on the connector. See the battery product page for instructions on how to do this.