Hyundai presented the LPI Hybrid at the 2009 Seoul Motor Show, and sales began as the Avante "LPI Hybrid" in the South Korean market in July 2009. The LPI Hybrid (liquefied gasolineeum injected) is a mild hybrid and is the world's first hybrid electric vehicle to be powered by an internal combustion engine built to run on liquefied petroleum gas (LPG) as a fuel. Hyundai developed the technology and all key components in the LPI Hybrid, together with its local partners including the electric motor, battery and low DC/DC converter. The lithium-ion polymer batteries, which the LPI Hybrid was the first hybrid to adopt, differed from lithium-ion batteries, using a claimedly more stable and fire-resistant dry polymer electrolyte from Korean company LG Chem instead of a liquid or gel.