Answer:D
Explanation:
A secondary battery or rechargeable battery is a battery that can be discharged and recharged.
It is an elcetrochemical cell which involve redox reaction i.e. oxidation and reduction. Oxidation is a process of loosing the electrons while reduction involves gaining of electron.
During discharging battery act as galvanic cell in which Chemical energy is converted into Electrical energy.
During Charging battery act as Electrolytic cell in which Electrical energy is converted in to chemical energy.
