[VladimirS]

@ezdiy and other that may be interested

After some time of trying and experimenting with battery charging on Inkpad 3, I can confirm that problems are 100% conected with internal charging circuit and internal device electronics.

I have replaced original battery with aftermarket battery, but from time to time, battery capacity drops suddenly (typical from around 50% to 5% in a very limited time, like 1 minute). I would say that battery is healthy and propperly charged....I also noticed that below around 60% device becomes sluggish and responsiveness and speed are greatly reduced.

Pocketbook Int had received multiple complaints about this, but only advice that I get from manufacturer are very stupid, customer support is very limited. They told me to reformat internal device memory. This is useless procedure. So my advice to all people, like Ezdiy said, to claim defective device as soon as possible and get new device in hope that it will be without defects.