Charging curve & taper
Power drops as the battery fills, especially above 80% SOC.
EVs rarely charge at the station's peak kW for the whole session. The charging curve shows how power rises at low SOC, holds near the maximum for a while, then tapers as the pack approaches full.
Taper protects battery health. A 250 kW stall might only deliver 80–100 kW above 80% SOC, so the last 20% can take as long as the middle chunk.