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Allspark Battery Station - BUILT-IN HYDROMETER - COLOR INDICATOR Some car batteries also has a color indicator which displays battery status. These sealed-top batteries have a built-in hydrometer to indicate charge. The
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Battery Magic Eye for Car Battery with 2 Balls D301 from China Manufacturer, Manufactory, Factory and Supplier on ECVV.com
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How does the little indicator window work on a car battery? What exactly is it telling you about the battery? - Quora
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