Actually, 13 hours of reading to from 100% to 20% might not be absurd. But, I would hope for more.
Kobo only says "Weeks of battery life" without any qualifications. For older devices, they were quoting either 1 or two months. That was based on 30 minutes a day reading. So, 1 month at 30 minutes a day is about 15 hours. And 2 months is 30 hours. So 13 hours from 80% of the battery is not to far off these devices.
The Elipsa will use more battery that the other devices. But, it also has a bigger battery. I don't remember seeing any comments on the battery life from other users of the Elipsa. I don't know if anyone has enough experience to really say what it will be.
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