Why not batteries instead of power supplies?

To add to the list, there are the folks at Definitive Audio/Living Voice in the UK that starting making full system battery supplies some years ago--covered in 6Moons, among other places. I'm sure improvements in battery technology have only helped them. Not sure if it is on their website, but they used to be set up in an Edwardian factory outside London. Long on my list for a visit. (Same folks who make those million dollar horns for your ship). They also sell stuff to lesser mortals, and seem to have a keen sense for interesting products. 

The late Gary Dodd produced some very fine electronics powered by batteries. Check out posts on the Dodd Audio and GR Research AudioCircle Forums for discussions about them.

I'm surprised nobody has brought up or suggested supercaps. Those things have insane capacity, very low internal resistance, huge voltage capacities, and charge very rapidly. A lot of you folks probably have supercaps in your digital gear already since they're replacing mounted batteries left and right. You could feed a bank of those the lumpiest, ugliest power imaginable, output those to a conventional RC filter supply, and you'd have a very clean, albeit massive power supply. 

I'm surprised nobody has brought up or suggested supercaps.

I think voltage rating is too small for them to be used as poweramp supply caps. Only 2.7v unless that's changed in the last year or so.

Cheers George

Cost!
http://www.mouser.com/Passive-Components/Capacitors/Supercapacitors-Ultracapacitors/_/N-5x76s?P=1z0x...