The ultimate detailing headphones...

[The Driver]

If there was a revolutionary jump (energy density) in battery technology things could really change. We still use fairly ancient technology such as lead acid batteries.

Well I'm sure a flex or rupes with a lithium ion battery might just work . Maybe I'll try an build one this summer. It's definitely possible with a rotary, especially with the pros being we all know rotors function at lower speeds an thus lower draw. da's I'm skeptical though...