The Sage has a rather poor battery life (meaning, it lasts for a few days - for me; as it depends on the frontlight level, wifi/bluetooth being on or not etc. it may last more or less for you). It can't be improved, by what I've read. The most you can do is to turn off the frontlight, wifi and bluetooth. I do keep wifi off, but the frontlight on at low levels, as I don't want to read without it.
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