Sleep mode on the Kobo is not nearly as power efficient as Kobo seems to think. I can only compare to my other e-reader, the Sony PRS-650. That one can go a month on a single battery charge with sporadic daily reading in sleep mode.. The KT, oth, needs to be powered off or it will barely go over a week. It doesn't help that the Battery meter on the KT is so unreliable. (At best, the unit will force shutdown when the battey is still at a quarter.)
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