Battery won't charge over 80% ?

Sorry for the late reply, couldn’t bother to let it drain when not listening.

I plugged it in around 14:30h today, around 21.15 it showed 91% when it was plugged in (the light on my wall charger went green) took it out of the plug, the charge number went down to 83% when I took it out of the wall, plugged in again now to see where that takes me…

Hours later (00:00) still the same… 91% and when unplugged it changes to 83%.

Guess I’ll just return it?