Also, I prefer not to let the battery fall below 20% before I recharge, if I can help it. I assume Kobo's 15-hour estimate means 15 hours to zero charge (or 5% or whatever the point is where you MUST recharge), but I start getting nervous at around 20% and just recharge it then, which makes it FEEL like I'm getting less than promised, when actually I'm not.
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