Alright, test failed. Today the KA1 drained again from 100% to 31% battery in 11 hours of sleep. I had auto-sync, auto-illumination, auto-sleep all disabled. Firmware 4.1.7729.
It's a beautiful screen but having issues with the touch screen, auto-illumination, uneven hue, and battery consumption. All combined, it's just too much for an expensive "premium" device. The Glo HD I picked up new for less than half the price didn't have any of these issues.
Last chance before it goes back to Kobo: full factory reset then try again. Will report results.
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