Quote:
Originally Posted by chippychipchap
Well as I mentioned, the Kindle sat in a drawer most of the time. But I charged it every now and then. It did get maybe 5-7 battery cycles in it's lifetime. So I think it's battery would rather qualify as brand new. I.E. I charged it full before I started experimenting the other day, and now, after again 2-3 days in a drawer, in standby (not powered off completely), it does not even show a tiny line down, still maxed out. 
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It is a Li-Ion battery.
1) Terminal voltage does not indicate storage capacity.
(The little icon indicates terminal voltage.)
2) Li-Ion 'ages' - even un-used, in a drawer.
(In fact, it 'ages' faster that way, once it self-discharges too deeply.)
3) The battery management chip, battery, and firmware have a 'battery calibration' function that needs to run often enough to be reset to the changing **storage capacity** of the battery.
(The use-case of the battery you describe is not acquitted to maintain the battery calibration.)