Checking our tags for missing descriptions (tag-wiki), I came across above mentioned tags:
- charging with the synonyms charger and battery-charging
(no synonym)with the synonym battery-manager
- power (no synonym)
Questions tagged power are either belonging to charging or power-management. So my suggestion would be to check all questions tagged power, and re-tag those to charging which rather belong there (I volunteer doing this, if the overall task/concept is agreed on) . After that, converting the tag power into a synonym to power-management.
I still miss the rep for some tasks involved (e.g. converting a tag into a synonym, or even propose it such) -- but as said, I'd volunteer for the re-tagging part.
While on it: power-options (3 questions altogether) should either be "dropped" (by re-tagging those 3 questions), or simply be made a synonym to power-management -- which is what those 3 questions relate to.