Anecdotal
I'm late to the game on this thread, but for others that still find themselves here allow me to add my anecdotal information.
I have a Kobo Glo that has a failing battery after 2.5 years. I read approximately 500 hours a year on it and don't charge until it drops below 25%. I use the light for probably 90% of my reading, however always set at 1% -- it is way, way too bright in a lightless room otherwise (e.g., reading in bed with the lights out).
Now it leaps downward from 100% to 70-something percent and so on until it hits the warning stage of "your battery is at X% please plug in to continuing using" [where 'X' is less than 10%] in a matter of days. When I plug it in it immediately jumps to a charge in the 30% range, i.e., the battery is clearly failing.
As others have said, I'm not in a position to pay $135 (original price) every 3 years for a new reader. I realize there are less expensive ones now, but I'm happy enough with my b/w Glo intended solely for reading books.
In short, sigh. A reader shouldn't go to the landfill every couple of years b/c of new technology. AKA unless Kobo adds a battery option, when this one fails I'll be buying from their competitor.
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