Three interactive animations showing what actually happens inside a lead-acid battery: the discharge reaction, the charge reaction, and how the built-in hydrometer reads state of charge.
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Watch electrons flow, sulfate migrate to the plates, and the electrolyte weaken as the battery gives up its charge.
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See the process reverse as the charger restores the plates and regenerates the acid.
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Learn how acid concentration relates to state of charge, and how the indicator eye reads it.
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