Given the dozens (hundreds?) of portable speakers out there, you'd…

Given the dozens (hundreds?) of portable speakers out there, you'd think it would be easy to find one that met the following criteria:

* powered by user replaceable 18650 batteries
* IPX7/8 water resistant
* bluetooth enabled

But this is the closest I could find:

https://www.amazon.com/Megadream®-Subwoofer-Hand-free-Bluetooth-Devices-Blue/dp/B00WBDW1R4

However, it's not water resistant.