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Cheaper, more efficient batteries add power to hybrid cars

New systems under development that charge the battery each time the brakes are hit add to fuel efficiency

Tesla Motors, in partnership with Panasonic, is building a US$5 billion battery "gigafactory" that may push costs below US$100 a kilowatt-hour within 10 years.

New York

NEXT-GENERATION hybrid cars combining electric and gas power in new ways are emerging as a low-cost alternative for consumers as batteries get cheaper and more efficient.

Battery packs for electric vehicles, loaded with lithium ion cells, now cost around US$496 a kilowatt-