I am running WGT with 2S + 17.5T (boosted) on carpet. Last race I had 1 brand new LiPo pack and other which is 4 years old. The difference in performance was quite obvious. After a good 1st final with the new battery I switched to old one and understood soon that I am screwed - no power at all. My laptime dropped by 0.13s and I even had problems lapping people because I just wasn't fast enough to pass quickly. But I kept my lines as close as possible and won the run. But what surprised me was that my overall result got even better, because my "error" was 0.088s. Now I just have to achieve the same stability with the new battery

Final 1
Final 2