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In this reaction, charge and discharge are reversed with high efficiency. Electrical energy used during discharge will be regained by recharging. In process of discharge, Lead Dioxide in positive plates and spongy Lead in negative plates react with Sulfuric Acid in the Electrolyte and create to gradually transform into lead sulphate, during which the sulphuric acid concentration decreases In process of charge, the positive and negative active materials which had been turned into lead sulphate gradually revert to lead dioxide and spongy lead respectively, revert to lead dioxide and spongy lead respectively, releasing the sulphuric acid absorbed in the active materials, during which the sulphuric acid concentration increases. When battery charging approaches its final stage, the charging current is consumed solely for electrolytic decomposition of water in the electrolyte, resulting in generation of oxygen gas from positive plates and hydrogen gas from negative plates. The generated gas will escape from the battery causing a decrease of the electrolyte, thereby requiting occasional water replenishment However, Suneom batteries utilize the characteristics of spongy lead or negative active material, which is very active in moist conditions and reacts very quickly with oxygen, thereby suppressing the decrease of water eliminating the need of water replenishment. |
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