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@bbtan123: Leaving brightness at max 24 is going to drain the battery relatively quick. You should try to lower it as far down as possible so you can still read comfortably. In the dark, try starting at 10 and go down so it is still comfortable to read. The scale on the Kindle is logarithmic, unlike the percent on a Kobo that goes by power level.
"Update Your Kindle" is always grayed out until an OTA update downloaded (need to leave wifi on to get it), or you manually copied an update file onto the Kindle over USB.
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