Question

write down the basic principal of storage cell

Answer 1

The question asked by you in which the word is principal but for yours kind information the word is principle.
Now the Principle of Storage Cell
A battery converts chemical energy into electrical energy is known as storage cell. A battery consists of some number of voltaic cells. Each cell consists of two half-cells connected in series by a conductive electrolyte containing anions and cations. One half-cell includes electrolyte and the negative electrode, the electrode to which anions (negatively charged ions) migrate; the other half-cell includes electrolyte and the positive electrode to which cations (positively charged ions) migrate. Redox reactions power the battery. Cations are reduced (electrons are added) at the cathode during charging, while anions are oxidized (electrons are removed) at the anode during charging. During discharge, the process is reversed.