The BYD Seagull is undergoing a significant dimensional expansion, according to regulatory filings published by China’s Ministry of Industry and Information Technology (MIIT) on July 10, 2026. The updated hatchback features a 150 mm longer wheelbase and a 425 mm increase in total length, shifting the model toward the platform size of the larger BYD Dolphin to better compete in the crowded urban electric vehicle segment.
Dimensional Growth and Structural Redesign
The latest MIIT certification reveals a comprehensive overhaul of the Seagull’s physical footprint. The vehicle now measures 4,205 mm in length, 1,810 mm in width, and 1,570 mm in height. Most notable is the 2,650 mm wheelbase, which represents a 150 mm increase over the previous model-year baseline. By stretching the chassis, BYD is effectively repositioning the hatchback to bridge the gap between its entry-level city cars and the more substantial Dolphin platform.
This structural growth has predictably affected vehicle mass. Regulatory data notes a baseline curb weight of 1,180 kg, with high-specification variants reaching 1,255 kg. Gross vehicle mass for these heavier configurations is rated at 1,630 kg. Despite the added bulk, the manufacturer has maintained standard 205/60 R16 tyres across all catalogued trims to ensure consistency in handling.
The BYD Seagull is marketed under several different names globally, including the BYD Atto 1, BYD Dolphin Surf, and BYD Dolphin Mini, depending on the specific international retail market.
Powertrain Upgrades and Performance Specs
To compensate for the increased dimensions, BYD has upgraded the propulsion system. The updated hatchback utilizes a permanent magnet synchronous motor (model number TZ164XYB) manufactured by Zhengzhou BYD Auto Co., Ltd. This unit delivers a peak output of 95 kW (127 hp), a substantial jump from the 55 kW (75 hp) motor found in the previous model.
According to the regulatory filings, this powertrain setup allows for a maximum top speed of 150 km/h. Energy storage remains consistent with the brand’s strategy, utilizing lithium iron phosphate (LFP) cells supplied and assembled by Shaoxing FinDreams Battery Co., Ltd. This integration keeps the vehicle aligned with the company’s broader low-voltage product offensive.
Market Competition and Smart Tech Integration
The strategic move to enlarge the Seagull comes as competition in the Chinese EV market intensifies. Data from China EV DataTracker shows that the Geely EX2 (Xingyuan) outperformed the Seagull in June 2026, recording 33,359 deliveries compared to the Seagull’s 9,825 units. The dimensional shift appears designed to capture a broader consumer base that may have previously opted for larger, rival hatchbacks.
Technological refinement is also part of the update. New government listings confirm an optional assisted driving camera integrated into the high-mounted brake light assembly. This follows earlier sightings of a lidar-equipped prototype undergoing road testing, suggesting that BYD intends to offer higher-tier smart driving features in a segment previously defined by basic urban mobility.
When comparing EV specifications in regulatory filings, always check the “curb weight” versus “gross vehicle mass” to understand the true impact of battery size and chassis reinforcements on vehicle efficiency.
Frequently Asked Questions
How much larger is the new BYD Seagull compared to the previous model?
The new model is 425 mm longer overall, with a wheelbase that has been extended by 150 mm to reach 2,650 mm.
What is the power output of the updated motor?
The new motor (model TZ164XYB) produces 95 kW (127 hp), significantly higher than the 55 kW (75 hp) motor used in the previous baseline model.
Does the new Seagull support advanced driver assistance systems?
Yes, regulatory filings reveal an optional camera setup integrated into the brake light, and previous testing has spotted lidar-equipped prototypes, indicating a push toward more advanced smart driving capabilities.
Who supplies the batteries for the updated Seagull?
The battery packs utilize lithium iron phosphate cells supplied and assembled by Shaoxing FinDreams Battery Co., Ltd.
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