Used BYD for Sale: Atto 3 vs Seagull vs Atto 2 Compared

Three models cover almost every used BYD for sale in the $9,000-$16,000 band: the Seagull at $8,900-$10,200, the Yuan UP (Atto 2) at $9,200-$10,500 and the Atto 3 at $13,800-$15,200. The Seagull is the city specialist, the Atto 2 the compromise, the Atto 3 the only one suited to four adults over distance.

All three use Blade LFP packs, so battery durability is not the differentiator. Size, power and charging speed are.

How do the three compare on paper?

Spec	BYD Seagull 305	BYD Atto 2 (Yuan UP) 401	BYD Atto 3 510
Length	3,780 mm	4,310 mm	4,455 mm
Battery	30.1 kWh LFP	45.1 kWh LFP	60.5 kWh LFP
CLTC / usable	305 / 220 km	401 / 289 km	510 / 367 km
Power	75 hp	95 hp	204 hp
DC peak	65 kW	65 kW	88 kW
Seats	4	5	5
Used price	$8,900-$10,200	$9,200-$10,500	$13,800-$15,200

Is the Seagull big enough for family use?

No, not really. The 2025 BYD Seagull 305km Freedom Edition seats four on paper, with 930 litres of cargo space when the rear bench folds. Two adults plus two children works. Four adults on a 300 km trip does not.

It is 3,780 mm long, which makes it brilliant in dense traffic and easy to park anywhere. It also means a 75 hp motor is doing real work above 90 km/h, and the range drops fast.

Why pick the Atto 2 over the Seagull?

Five seats, a 530 mm longer body and a 45.1 kWh pack. The 2024 BYD Yuan UP (Atto 2) 401km Huoli Edition costs only $300-$1,000 more than the Seagull but gives 69 km more usable range and a usable rear bench. On value alone it is the best of the three.

The trade is dimensions. At 4,310 mm it is a small SUV, not a city car, so parking gets harder and efficiency drops slightly at highway speed.

When does the Atto 3 justify another $4,500?

When you need 204 hp and 367 km of usable range in the same car. The 2022 BYD Yuan PLUS (Atto 3) 510km Flagship is the only model here that handles a motorway commute without drama, thanks to 60.5 kWh of capacity and a stronger motor (204 hp).

It is also the oldest platform of the three, and the 2022 examples have known weak points: rear floor rust in humid climates and sluggish infotainment after three years of OTA updates. The 2023 Atto 3 Champion Edition 430km fixed most of that but carries the smaller pack.

Which has the best battery record?

All three use LFP, which is the durability advantage of buying BYD. Fleet data from Chinese leasing companies puts the Seagull at 94-97% SOH at 30,000 km, the Atto 2 at 93-96% at 40,000 km and the Atto 3 at 91-94% at 50,000-60,000 km. Larger packs cycle less per kilometre, so the Atto 3’s lower figure reflects age and use rather than a weaker cell.

• Ask for the OEM app screenshot, which shows SOH and charge count.
• Reject anything below 88% SOH on a 2022-2023 car.
• Check for cell voltage spread under 30 mV if you can get a scan.
• Confirm the car is 非营运 (private), not 营运 (commercial).

What about charging speed in practice?

The Seagull and Atto 2 both peak at 65 kW, giving roughly 30-80% in 30-35 minutes on a good charger. The Atto 3 peaks at 88 kW and takes about 30 minutes for the same window on a bigger battery — meaningfully faster in km added per minute.

None of the three is quick by 2026 standards. 800V cars like the XPeng G6 do the same job in 20 minutes. If DC charging is central to your routine, budget higher.

Which one should you actually buy?

• City commuter, one or two people: Seagull 305. Cheapest to run, easiest to park.
• Family, mostly urban: Atto 2 401. Best value in the range.
• Regular highway use, four seats in constant use: Atto 3 510. The extra $4,500 buys range and power you will feel daily.

Key Takeaways

• Used BYD prices in China: Seagull $8,900-$10,200, Atto 2 $9,200-$10,500, Atto 3 $13,800-$15,200.
• All three run Blade LFP packs — durability is similar, pack size is the real difference.
• The Atto 2 is the value pick: five seats and 289 km usable range for around $10,000.
• The Atto 3 is the only one suited to four adults on a motorway.
• Reject any car below 88% state of health on the BMS screenshot.