BYD SEAL U vs Smart #3

Side-by-Side Specs

Charging Speed

The Smart #3 has the higher published DC fast-charging figure at 150 kW, which is roughly 7% higher than the BYD SEAL U at 140 kW. In practice, that figure only tells part of the story. The charging curve, battery temperature, and state of charge all affect how quickly your car actually charges.

For the 10-80% charge (the most common DC fast charging scenario), the Smart #3 finishes in about 28 minutes, which is 6 minutes quicker than the BYD SEAL U at 34 minutes. On a road trip, that difference adds up over multiple stops.

Range and Efficiency

The BYD SEAL U has a WLTP rated range of approximately 500 km, which is roughly 85 km more than the Smart #3 at approximately 415 km. WLTP is a standardized lab test. Expect your actual range to be lower, varying with speed, weather, terrain, and driving style.

Efficiency matters more than battery size for daily driving costs. The Smart #3 consumes 175 Wh/km, compared to 205 Wh/km for the BYD SEAL U. That means the Smart #3 uses less energy per kilometer, which translates to lower charging costs and fewer charging stops on longer drives.

A more efficient car does not always mean more range. Battery size plays a role too. The BYD SEAL U has approximately 87 kWh of useable battery , while the Smart #3 has approximately 62 kWh.

Which One Should You Choose?

If fast charging is your priority, the Smart #3 has the higher published DC figure (up to 150 kW) while matching the quickest published 10-80% time at approximately 28 minutes. For long road trips, published stop time matters more than the headline kW number alone.

For AC charging (home wallboxes, workplace chargers, and public street chargers), the Smart #3 supports up to 22 kW, compared to 11 kW for the BYD SEAL U. In Europe, many public chargers are 22 kW AC, so this difference can mean charging roughly twice as fast at those locations.

If you mostly charge at home or at work and care more about daily driving costs, the Smart #3 is the more efficient choice at 175 Wh/km. Lower consumption means lower electricity bills over time.

For maximum range between charges, the BYD SEAL U has a WLTP rated range of approximately 500 km, which is roughly 85 km more. Both are capable EVs. The best choice depends on how you charge and how far you drive.