I found a lot of my old not-so-good attys came back to life on 4.8v. It seems to heat the atty enough to burn off a lot of old juice. It *will* run hotter, so I wouldn't go with LR attys, but I've used down to 2.0Ω with no problem. Most of the time, I prefer around 2.5-2.8. I like warm, but not hot.
If it will burn juice off an older LR zombie and get it to perform better, wonderful! vaping > Cleaning!