What will you be using it for? Where will you be using it? What is your goal? What is your budget?
Most quality PA speakers aren't run from a battery as the louder anything gets, the more power it must draw, especially for something of high quality. So, while I have one of those portable Bluetooth speakers that I use when I'm at the basketball court, it is neither that loud, nor of very high quality. The battery just isn't sufficient to drive it and the drivers aren't designed for it.
So, perhaps a bit more information. Certainly, from what I've seen, almost all people that need actual quality go to a good powered (plug-in) system, and then they actually use wired connection or professional grade wireless mics.