Sounds like the app can't calibrate it's data from the battery.
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I personally note that there is no use of accubattery.
Never believe much on those apps!
All battery has got some charging cycle life and it will reduce by a fraction with every time u fills and uses the juice. Just use it the way u want n keep in mind that it will be good for at least 2 years.
So, I would suggest to remove this app. "vidmate"