Minimal / worth it / non impactful assuming you charge nightly anyway and no.

It does take more battery than just a blank screen, but it is kept extremely dim and automatically changes placement on the screen every so often so it doesn't burn in. Also, if it doesn't detect light (like if it were in your pocket) it turns off. I havent done the math, but i think playing a game on your phone for like 30 minutes would probably drain the battery a similar amount to a whole day if this display