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What is Lead Acid Battery? Construction, Working ... peroxide (PbO 2) – It forms the positive active material. The PbO 2 are dark chocolate broom in colour.; Sponge lead – Its form the negative active material. It is grey in colour. Dilute Sulfuric Acid (H 2 SO 4) – It is used as an electrolyte. It contains 31% of sulfuric acid. The lead peroxide and sponge lead, which form the negative and positive active materials have the little ...

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