FWIW, I drained the battery to 13% and then recharged. That night I used koreader in nightmode and last night I used nickle with the nightmode mod, approximately the same usage each night, read a while, sleep, read, sleep, etc. Never turned the KA1 totally off or put it to sleep with the button either night.
Night with koreader battery went to 82%
Night with nickle battery went to 92%
I do wonder if the light having to be at a higher setting for koreader is causing some of the extra battery usage. There is a large drop in light when koreader starts. I have it set to start at 23% and nickle to be at 3%. Last night I used nickle nightmode at 2%. I never noticed this drop in light with koreader with either the h2o or the Voyage.
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