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Federal stimulus money has helped cut the high cost of lithium-ion batteries, but not nearly enough to make electric cars affordable. Now there’s an abundance of advanced battery manufacturers and not enough major companies to buy them. Many plants in the United States, South Korean, Japan and China that got government subsidies aren’t producing many batteries, if at all. Three years ago Michigan’s governor touted the state as the new battery capital of the world. There were five new advanced battery plants in the works, all of which were to get major tax breaks and some federal grants. But most of these plans have not worked out.