BYD, a Chinese automaker, entered the French market at the end of 2022 and has since expanded its presence in the used car market. Among its popular models are the Atto 3, Dolphin, Seal, and Seal U, which are increasingly appearing on major classified sites such as La Centrale and L'Argus. These vehicles are powered by BYD's internally developed Blade battery, which uses lithium-iron-phosphate technology known for its safety and longevity. Out of twelve models in the company’s catalog, six are less than two years old, which limits depreciation and allows early market trends to be observed. In 2026, hundreds of used BYD cars are listed on online marketplaces, with the Atto 3, Dolphin, Seal, and Seal U being the most common. Prices vary from around 16,000 to over 50,000 euros, with a concentration between 20,000 and 35,000 euros, a range that fits many household budgets. The Atto 3 is particularly popular, a compact electric SUV with 204 horsepower, capable of reaching 160 km/h and accelerating from 0 to 100 km/h in 7.3 seconds. It offers a range of up to 420 km, a spacious trunk, and a well-equipped interior. In real-world use, its range is generally between 300 and 350 km. A 2023 model with 40,000 km was listed at 26,000 euros, reflecting the current price level for a well-established model still under warranty. BYD produces its own batteries, and the Blade battery is designed to be durable and safe. Initial user reports do not indicate major issues with the powertrain or high-voltage battery. The company also offers long-term guarantees to build consumer confidence: 6 years or 150,000 km on the vehicle, 8 years or 250,000 km on the battery, and 8 years or 150,000 km on the drive unit. For a car two or three years old, these guarantees are largely still in effect when purchasing from the used market. Despite these strengths, some users have reported issues such as multimedia system malfunctions, problems with the 12 V battery, and minor software bugs. The BYD Dolphin has faced specific criticisms, including erratic driving behavior on early models and air conditioning that fails to work above 25 °C on models before 2025. These issues may affect the car's appeal in warmer climates. Other concerns include occasional ergonomic challenges and interior noises, which should be checked during a test drive. Meanwhile, the dealer network is expanding rapidly, with more than 100 BYD sites planned in France by 2026, which is important for maintenance and support. Depreciation rates for BYD models are less severe than expected for a new Chinese brand. Over three years, the Atto 3 depreciates around 40%, a rate comparable to the Kia e-Niro and better than the Peugeot 3008. The Seal sedan performs even better, with a depreciation of about 30%, outperforming the BMW i4 and Hyundai Ioniq 6. Prices in 2026 reflect these trends, with the Dolphin ranging from 16,000 to 22,000 euros, the Atto 3 from 20,000 to 28,000 euros, and the Seal from 26,000 to 51,000 euros. The Seal U DM-i, a plug-in hybrid version, is priced between 27,200 and 47,600 euros. Each model has its own characteristics. The Dolphin offers spacious interiors and affordable prices, but earlier models have known issues with air conditioning and driving behavior, suggesting newer models are preferable. The Atto 3 shows normal depreciation for a compact electric SUV, with good equipment and family-friendly features. The Seal is well-equipped, comfortable, and retains value well, although its range is limited by higher energy consumption. The Seal U DM-i offers a price alternative to the Peugeot 5008 and Renault Espace, though it lacks a seven-seat option. To ensure a secure purchase, the BYD Certified program, launched in 2026, provides a framework for evaluating used cars. This includes a thorough inspection, a road test, battery safety checks, and the continuation of long-term guarantees. Buyers should also verify the battery health, check remaining guarantees, test multimedia and driving systems, and ensure the vehicle's proximity to a service center. Comparing the requested price with online listings and inspecting tire and brake wear are also important steps.