I have an Android tablet (wifi only; no cell service). Sometimes, I want to reset the chart it shows in the battery menu, so that it only shows the last few min instead of the last who knows how many hours. I know it can be done because I did it once before, though I wasn't paying attention to how it happened that time. Thus, I no longer remember what I did that time. So how can I do it again?
By clearing that Chart you mean that you have to reset the "batterystats.bin" file in your system. For that few apps are available on the Playstore but unfortunately you need to ROOT your device since those are system files. One such app is here
Hope that helps!