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The technology that will power a new generation of electric cars has been overhyped, leading industry sources said at the Shanghai Auto Show yesterday.
Chinese companies, such as BYD, have been lauded for developing advanced batteries that could power a revolution in motoring.
BYD, a former battery maker, was the first company in the world to start selling a heavily-electrified hybrid car last December, easily beating larger rivals such as Toyota to the market.
As a result, Warren Buffett, the US investment manager who runs Berkshire Hathaway, bought 10pc of BYD last December for $230m (£158m).
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