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Being a cynical curmudgeon (in the making, I only possess junior status presently), based on lack of proof of the actual battery level and Kobo's lack of precision in that department, my guess is something got zapped in the routines or tables used to determine actual charge status, or the routine got scrambled and would have perhaps required a full discharge/charge cycle or two to figure things out. The firmware was probably just incorrectly reporting the charge level, or maybe it was correct considering how long Kobos typically sit on 100% and often seem to get stuck at different levels for a while. The problem is they're probably just looking at the voltage level of the battery under "normal" current draw and interpolating on a straight line. The problem is that while lithium batteries are pretty good about it, they have a discharge CURVE like most batteries, not a straight relationship between voltage and remaining capacity. The curve that was dropping faster may in fact have been the more accurate of the two overall.
Kobo... Join the Adventure! (If they use that, I want compensation...)
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