Use Battery Backup For Preamp and TT?

I am recording my L.P.’s using 24/96 (DVD audio standard) on to my computer. Fidelity is the utmost concern. For my preamp and Turntable, I’m thinking of using a hefty battery backup, with the power to it turned off while recording. My theory is, this would ensure really clean battery power during the recording process.

I am really looking for some input on this idea. It might be a good one, or a bad one. LOL I know with some power inverters, they do not have a very good replica of a 60 Hz sine wave, so I don’t know if that is true for battery backup. Any ideas?