Why no high end battery powered wireless speaker systems?

I would love to have a set of wireless battery powered high end speakers and subwoofers.  With so many high end powered speakers  and subwoofers around these days, it would seem to be the logical next step to make them battery powered and eliminate all the cables.  I'm a little surprised that Sonos hasn't created a wireless system yet with their Play 5 speakers -even though I don't think they have any interest in cultivating the audiophile market. What are the hurdles standing in the way of this?  Are there any in the works?   
@millercarbon-oh wise one. If the speaker draws 100 watts, a 56volt 10ah rechargeable battery should run the speaker for: 100/56=1.786 amps per hour.   So a  10ah battery divided by 1.786= 5.59 hours of max run time. of course I could solve the problem by getting a Tesla powerwall and run the whole stereo and house with that.