The battery pack capacity C bp [Ah] is calculated as the product between the number of strings N sb [-] and the capacity of the battery cell C bc [Ah]. The total number of cells of the battery pack N cb [-] is calculated as the product between the number of strings N sb [-] and the number of cells in a string N cs [-].
This logically suggests that when you talk about an "equivalent capacitance" to a battery that you mean a capacitor that stores or can deliver the same energy as the example battery. In theoretical terms your calculation is correct for an idealised battery (constant voltage throughout discharge, defined mAh capacity) and an idealised capacitor.
Car battery specifications like group size, Cold Cranking Amps (CCA), and Reserve Capacity (RC) are key to choosing the right battery. Group size ensures proper fit, CCA measures cold-weather starting power, and RC shows how long the battery can supply power if needed. These specs help ensure reliable performance.
Battery is great at stabilizing voltage, capacitor just holds any voltage you connect it to. It's basically a very small battery (in terms of capacity) but very powerful (in terms of peak current). If your car can live with widely changing voltage (or if you put enough capacity to never discharge below 80%) there are no modifications needed.
Your formula for energy content of a capacitor is correct. Whether the energy is all usable is another matter. Your battery energy formula is correct for an idealised battery. What you have calculated is not an equivalent capacitance but, instead, the capacitance required to store 9kJ of energy at 2.7V.
Capacity describes the amount of energy the battery can store, typically measured in milliampere-hours (mAh) or ampere-hours (Ah). Higher capacity provides longer use before recharging. For instance, a 5000mAh battery will last longer than a 2000mAh battery in the same device. 2. Size: Size refers to the physical dimensions of the battery pack.
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