On my Onyx Boox there is a setting that enables you to do a full screen refresh always, i.e. with every page turn, or only once with every 3, 5, 7 or 9 page turns. I used to use the once per 9 pages setting, and some time ago changed to 'always' (to avoid any ghosting, although it was not that bad). I did not notice any deterioration of battery life.
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