Johnson Controls is positioning itself to be a technology leader in hybrid car batteries as the industry shifts to lithium ion batteries from nickel metal hydride batteries used in today's hybrids.

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Automakers are scrambling to get lithium ion batteries into hybrid vehicles, and they are hoping these batteries will make plug-in hybrids and all-electric vehicles possible soon, too.

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But the strain on a lithium-ion cell in a plug-in is much greater than on the batteries in today's hybrids.

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