What portable media center (boombox) would you recommend for parties of 20 people in nature?

Question

Iron

I took care to buy a boombox sufficient for a party on the street (15-20 people)
Of the candidates were:
Harman Kardon - great sound but batteries! Even if you replace them with batteries, you don’t want to pull them out for charging. And the design is also somehow not the same,
Teufel XL - According to the characteristics, it seems that, but the design is again, and people scold for buggy and useless support,
Here I heard about B&O Play Beolit ​​15 - so far only the design raises some questions, right now I will dig further .
And there doesn't seem to be anything else worth seeing.
In terms of money, I want to meet hundreds of euros in 6 euros, well, a maximum thing. There is enough stationary music at home, but it’s easier to take something more expensive for nature, it’s easier to fit a car, everything is in abundance there. Now I use Jabra Solemate outdoors - for its size it's super, and the sound and design and convenience, I also looked in the direction of Jabra Solematemax - but judging by the reviews, it does not reach its size in sound. Something like Jabra solemate would be ideal, but 5 times more and resp. with increasing sound.
yes, I forgot to add that I also watched TDK T78532 3 - the sound is super, the design is beyond words, but again, fucking batteries ...
it's just amazing how you can not understand the aspirations of customers.
The other day I found out that a new version of Harman Kardon Go + Play has been releasedFinally, with batteries, and the sound seems to have improved . I bow to him.
I also considered Teufel Boomster (not XL). But he loses the campaign to the new HC in terms of sound, although the battery lasts longer.
What thoughts and advice would you give?