What would be the answer of 8?

Dear Student,
8. A secondary cell or battery is one that can be electrically recharged after use to their original pre-discharge condition, by passing current through the circuit in the opposite direction to the current during discharge. It comprises of one or more electrochemical cells and is a type of energy accumulator.

Several different combinations of chemicals are used as Lead-acid Ni-Cd, Li-ion etc. and some common example of secondary cells are; AA size batteries used in torches, remote controllers, Nokia and other mobile phone batteries etc.

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