The Sage is certainly a poorer battery than other Kobos, but more than the Android based eink. Over 20 hours solid reading and 45 minutes recharge while reading.
Often charged enough when on PC for Calibre. I leave it charging after eject.
I used PW3, H2O original, Libra, Libra 2 and find battery run time of the Sage fine. The Elipsa is too big and heavy to read novels.
Loads of people like the portability of the 6" models.
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