The Key thing is to read to the comment session before upvoting a post, once you see cheetah do not upvote!

So in case you decided to unvote, you power remains depleted i believe:

It's like taking a salt from a container and add to a food on fire, you mistakenly over-salted it and you decide to per-boil to remove the excess salt. That doesn't add back to the container you took the salt from!