Secondary cells can be recharged.
The chemical action inside the cell can be reversed by applying a higher voltage to the battery terminal. This is done by connecting the +ve terminal of the charger to the +ve terminal of the cell and -ve terminal of charger to -ve terminal of the battery.
This will return the original composition of the cell elements.
At this time the cell is said to be charged. Secondary cell can be charged and discharged many times until it is deteriorate.
Commonly used aircraft battery is LEAD-ACID and NICKEL-CADMIUM.
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