Having recently taken a long aeroplane trip, my Glo stayed on 100% for about 6 hours of lighted reading, and then dropped about 2% for every 2-3 hours after that, with non-reading periods being in sleep mode.
I think that Kobo should load 'average' battery use data at the factory, and then adjust this as necessary. With modern manufactoring processes, a vast majority of the batteries should have similar charge/discharge rates, and loading the 'average' rates initially would mean that the battery usage percentages are more correct, out of the box.
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