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Electric cars in Japan to show battery health

Gauges form part of effort to support used-vehicle market

The Nissan Leaf already tells drivers how much of a battery's capacity remains. (Photo by Tomoki Mera)

TOKYO -- Electric vehicles will indicate how much charge they can still hold under proposed guidelines being drawn up for carmakers by the Japanese government.

The Ministry of Economy, Trade and Industry envisions the dashboard displaying the health of the lithium-ion batteries, whose capacity gradually shrinks under repeated charge-discharge cycles.

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