I finally went through and winnowed out the chaff from my Collections. I'm down to 35 now. I don't think 70 or 80 are all that much, but in my case, it looks like many of them came down with my initial metadata link in Calibre. In Calibre's Preferences > Metadata Download, I've got "Prefer Fewer Tags" checked and "Max Number of Tags to Download" set to 5. But, sometimes I forget to double-check what gets downloaded and another garbage tag gets into the mix.
Anyway, I'll see if the smaller number of tags helps with my battery drain, but I'm not holding my breath. If the drain were constant across the whole battery capacity, it might help. But, my SBD seems to start up around the battery being at 50%-ish. I assume the battery isn't putting out enough voltage once it gets to that level. I'll just have to replace the device with something else. The problem is that I was so underwhelmed by the Sage's battery life a year ago that I returned it:
https://www.mobileread.com/forums/sh...d.php?t=343407