Hyundai offers 'lifetime battery replacement guarantee' for Sonata Hybrid

Hyundai said Monday that, in the event of breakdown of the Sonata Hybrid's lithium polymer battery, the company will replace the battery free of charge and pay for its recycling costs. Hyundai, which co-developed the lithium polymer battery with LG Chem, says the Sonata Hybrid's drivetrain can hold up under more than 300,000 miles of driving with "minimal degradation."

Hyundai continues to pitch its cars' reliability and fuel efficiency as a way to boost U.S. sales. For the model year 2010, the most recent year the U.S. Environmental Protection Agency tracked fleetwide fuel efficiency, Hyundai achieved a fleetwide fuel-economy level of 25.9 miles per gallon, best among the 14 largest automakers. 

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