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During the absorption stage, the voltage is held constant, and the current gradually decreases as the battery charges. This stage is necessary to fully charge the battery and ensure that all the lead sulfate is broken down into lead and lead dioxide.
Finally, during the float stage, the Lead Acid Battery is maintained at a lower voltage to keep it fully charged without overcharging. This stage is necessary to prevent damage to the battery and increase its lifespan. Lead-acid batteries require proper maintenance to ensure their longevity and performance. Over time, the plates in the battery can become covered with lead sulfate, which reduces the battery's capacity and lifespan. To prevent this, the battery should be periodically charged and discharged to keep the lead sulfate from building up.