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BYD Qin includes two variants called the BYD Qin Pro and BYD Qin Plus. The BYD Qin Pro was launched in September 2018, while the BYD Qin Plus was launched in 2021. An updated version of the first generation, known as the "all-new Qin", is sold alongside the second generation Qin variants. The BYD Qin concept car was unveiled at the 2012 Beijing International Automotive Exhibition. It was named after the Qin dynasty, China's first imperial dynasty. The Qin was designed with BYD's next-generation, more efficient, dual-mode, electric powertrain. The BYD Qin uses a smaller lithium iron phosphate battery (LiFePO4, or LFP) than its predecessor, the F3DM: 13 kWh instead of 16 kWh. The LiFePO4 battery has a high energy density, can withstand up to 4,000 charges and still retain 80 percent performance, and uses no toxic heavy metals in its manufacture. Due to its improved design, the new battery is about 50 percent smaller and lighter than the one used on the F3DM. The reduced battery pack size translates into reduced price at the expense of the all-electric range, which BYD estimates at 50 kilometres (31 mi). The larger battery in the F3DM delivers an all-electric range of 97 kilometres (60 mi). BYD said the Qin would be seven percent more efficient with savings in power and energy in all-electric (EV) mode.