What is the problem with shaking one of the no battery/shaking flashlights which is on on shabbos?
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Any reason this isn't analogous to winding up a mechanical watch that's currently ticking (on-time)?
The watch case was discussed by R' Shlomo Zalman Auerbach IIRC; it was considered "fixing" the watch and prohibited. Heard in Rabbi Heinemann's discussion of Sabbath-mode ovens.