I think I get about 20+ hours on a Sage. No front light, Wifi or BT. Maybe more. I don't find it more onerous in lack of run time than Libra, Libra 2 or Paperwhite 3. Typically 40 minutes charge and I have a 3m USB cable.
Kobo & manage metadata via Calibre is far far better than Kindle. As I have several models of both I have experience and would not buy another Kindle.
I've not seen CSS or other ebook issues on Kobo. Kindle is fussier.
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