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In my case the flickering or pulsing is definitely at a certain brightness range, 3-4, but have to say it's almost imperceptible without the screen protector.
As for batteries and fluctuating current, could be a bad LED, poorly soldered joint or anything else in the circuitry as well.
My reason for using a screen protector is that I don't use a case and leave my reader laying around and toss it in my backpack when I travel. I can care less if the body gets scratched up but I want a clear screen.
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