The KA1 does drain about 2-3% every 24 hours when sleeping, even with Wifi off. That means it'll be empty in about 30-50 days (45 on average, or 6 weeks), which is a faster drain than my KPW1.
Normally I don't leave the reader lying around that long though, but I haven't been using it the last three weeks. Nothing wrong with the reader, but I have just found that I *really* don't like to use such a thin and large device without a cover. I've been using my KPW1.
I'm awaiting the Noreve cover I've ordered. It has been sent last Monday, so I expect it to arrive somewhere at the end of this week.
I do use my 10 inch tablet without a cover but that is because it's 5 years old. It's thick (9.5mm or so), heavy (620 grams), and it has Gorilla glass. That thing feels more like a small computer screen instead of a tablet.
Most people complain that a cover adds bulk and weight, but that is what I'm actually counting on. I want my KA1 to be a lot thicker and heavier. Now I'm not confident in using it. (No, I'm not clumsy, but I'm just used to a reader that feels like a small, hardcover bound book that has the strange ability to be folded back
)