Battery power? Stereo pair?

I'm interested in the T15. I'm hardly an electronics engineer though I have soldered a few kits in my time.
Is it possible to power this preamp by battery?
I'm only considering the single preamp at the moment, but what if I wanted to add another channel? If I bought another kit separately, would it have matched components? Would it matter?
Is it possible to power this preamp by battery?
I'm only considering the single preamp at the moment, but what if I wanted to add another channel? If I bought another kit separately, would it have matched components? Would it matter?