iPhone battery meter is a liar!

i've never quite understood , can't seem find exact explanation anywhere. if charge iphone 100% , take off charge shortly after it's reached 100%, battery drop faster if leave on charge few hours after it's reached 100%.

example, if iphone's been on charge night, in morning when start using battery meter remain @ 100% couple of hours before dropping 99%.

if charge during day , take off charge shortly after it's @ 100%, it'll drop 99% within ten minutes of use.

in both instances battery meter reads 100%, 1 last heck of lot longer other, though both start 100%. gives?

 

have tried running down until powers off , charging way? may need calibrated.

 

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