1) Usage time: As the usage time increases, factors such as electrolyte dehydration, corrosion between the electrode plate and the connecting strip, plate deformation, and the detachment of active substances result in a decrease in capacity and an increase in internal resistance.

　　2) Charge amount: Due to differences in the depth of electrolyte injection, the thickness of reactants on the electrode surface, and the porosity of the electrode surface, there is a significant difference in internal resistance, resulting in a significant difference in charge amount.

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