Headcanon: Graviton plating uses battery power. That's why they don't fail, they're not tied to the main grid (and they shouldn't be). You can adjust an individual plate and all that, and probably a lot of techies spend their work day making sure the plating and batteries work, but I can get that.
We hear a lot about 'batteries' but again this isn't universally applied as it should be. In Beyond, Chekov or Sulu is like, well, get me to the bridge, maybe there's power there for a console...why isn't the console using (or could be tied up to) a battery? Battery tech should be amazing in tech, it's not like phasers are using beamed power from the warp core, and a phaser can melt half a building, or disintegrate a person.