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Residents of the southern Chinese city of Shenzhen are mounting a vocal campaign against plans to build a battery plant in their neighborhood, following a slew of cases of lead poisoning in children across the country in recent months.

The plant is scheduled to be built, beginning next year, by China's BYD Group, which numbers among its shareholders U.S. market guru Warren Buffett. If it goes ahead, it will export state-of-the-art rechargeable batteries around the world.

But residents of Shenzhen, a city of 10 million people, say they are concerned that it sits too close to reservoirs which supply the city with drinking water.