BYD Automobile Co Ltd (simplified Chinese: 比亚迪汽车; Pinyin: Bǐyàdí Qìchē) is a Chinese automobile manufacturer based in Shenzhen, Guangdong Province. The firm was established in 2003 and is a part of BYD Co Ltd, an innovative rechargeable battery maker. As of 2010 production capacity is estimated at 700,000 units/year, and that year's sales reached 519,800 making the company the sixth largest Chinese car-maker by units sold. 2010 also saw continued popularity for its F3 model, which became the most-purchased car in China.