If you charge the Nokia 8 battery via the charging cable, you may notice that the charging process stops before the battery is 100% charged. The battery cannot be fully charged.
The cause of this phenomenon is the following:
If the Nokia 8 is charged in summer at high temperatures or in winter at low temperatures, the charging electronics of the smartphone comes into effect. This means that to protect the battery, the charging current is limited and the smartphone's battery cannot be fully charged.
In order to charge the battery fully, only the following procedure will help:
Charge the Nokia 8 in a place which approximately corresponds to the room temperature of 21°C. More specifically, remove the Nokia 8 from the sun or cold environment. You now know why your Nokia 8 doesn't have a 100% rechargeable battery.