This is not a fault; it is a battery health charging strategy.
When lithium-ion batteries approach full charge (typically above 80% State of Charge), the control system actively reduces the charging current to enter “trickle charging.” This prevents overcharging and minimizes heat generation, thereby significantly extending the battery’s overall service life. Therefore, the final 20% of charging takes longer — this is normal.
Does the charging speed slow down in the later stage, and does the displayed input power decrease—is this a fault?
