Faraday’s law is the law of one of the important electrochemical science. Theory suggests the electrolysis of electricity through the electrode and the quality of the relationship between the reactants, and temperature, voltage, electrolyte concentration and solvent nature, independent of such factors as electrode materials. But in the actual electrolysis process of electricity through the electrodes can not be used exclusively for the necessary reactions, that is part of the power for the occurrence of side effects, usually to place necessary for the reaction of the total electricity consumption accounted for by the ratio of electrode , called the current efficiency or power efficiency.

Secondary battery charging process is an electrolytic process, the initial charge, Dell Studio XPS 1340 battery because there is no or low occurrence of side effects, mainly for consumption by the electrode active material conversion, but the late charge, most of the discharge to have three into electrode active material, electrode polarization time increased, the use of aqueous electrolyte secondary battery, along with the positive electrode active material on the conversion at the same time, there will be oxygen precipitates; With the transformation of negative active material, while also precipitation with hydrogen, resulting in current (volume) efficiency (known as charging efficiency) decreased. Secondary battery charging efficiency of the electricity used to transform the active substance or active substances transformed volume and the total electricity consumption by the electrode active material or theoretical conversion ratio of the percentage amount.

In addition, since the bipolar nature of the different active substances, resulting in oxygen evolution or start charging when the depth of analysis of different complex, HP Pavilion dm3 battery namely, to reach the beginning of oxygen evolution, hydrogen evolution at different times, as lead-acid batteries, when the depth is about 70% of the positive charge of hydrogen evolution begins , while the negative charge depth of about 90% hydrogen evolution begins.