I don't have exact numbers but so far since I charged it around Christmas, with reading an average of 4-6 hours per day (well, per night, before bed), with random 2-3 minute time periods with wifi on to sync and get new books I purchased, it is still only half empty. So that means around 17 days it has been used for reading at a typical 4 hour time span... At this rate I should reach an easy 30 days before it needs charged.
This is K3 wifi only, no light, wifi only on for 2-3 minutes at a time and off the rest.
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