I might have to do a "reset" of the battery by letting it go to "plug in" screen. I have a O1 with 2 covers. So I usually do a bit charge one after the other and then I read until both covers are down. Repeat. As i have shifted my reading away from the O2 back to the smaller and more comfortable size for me O1, I noticed that the battery display doesn't match.
Its not going down dramatically as others seem to have that issue, its just a different number on the top and in the popup display. So the top menu bar says 76%, the popup says kindle batter 97% and cover 82%. It seems to always be a few percentage off. Course I don't know if the 76 or the 82 is the correct one.
Hasn't really affected my reading on it and I haven't noticed any more drain than in the years past, but its bothering my OCD.

. Its doing the same with both charging covers, just in a different way. On the 2nd cover the difference is 9%.
I'll just try to ignore in the meantime and read as usual.