On the April 2022 FW the Sage battery life (no frontlight, wifi or BT on) seems fine. Maybe not as good as my Libra, but better than PW3 and especially Boyue Mars.
I still use the Libra for proofreading / annotation, but use the Sage for non-work recreational reading, or notes while reading on Libra (using Elipsa pen).
The Elipsa is to read big PDFs generally and also proof check PDFs for our own POD, stuff like words mysteriously at wrong size or page mirroring / page numbering gone wrong. The actual content proof / annotate is done on epub version.
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