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From what I read, KA1 have a much smaller battery and that also can affect perceived "battery drain".
I'm not telling that problem is 100% solved, but it may be on its way to be solved. As we can see, there's also problem with charging device (also can produce false sleep that causes battery drain).
Just to mention, it also highly depends on what battery percentage you look at the moment. On my H2O, lower percentage (under 50%) drop much faster than higher (above 50%). For my device battery percentage is far from linear. I start to charge my device as soon as it drops under 40% as it looks to me like it is actually 10% or maybe even less.
For your device (it can mean your device specifically, or all KA1 in general) there could be different battery draining function described through percentage. First try to see what different battery percentage actually means.
And yes, I noticed this for all devices I have, not just ebook readers. If device shows 30% of battery doesn't always mean that you have 30% of battery actually left.
On the other hand, you maybe already know this.
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