A car battery is measured in (CCA) or Cold Cranking Amps. The definition of the Cold-Cranking Amperage (CCA) of an automotive battery is the amount of current a given battery can deliver for 30 seconds at zero (0) degrees Fahrenheit without dropping below a specified cutoff voltage (manufacturer specific, but usually 10.5 volts). In short, a car battery will deliver a high current for a short period of time, like starting a car.
But you see, a car battery can only supply a small amount of current (amps) over a period of time. Also, a car battery is not engineered to be fully discharged. Thus discharging and then recharging a car battery only a few times will result in battery failure.
And, with a car battery there is no visual way to determine the voltage output, resulting in inconsistent discharge flow rates. In short, a car battery could be used to power some pumps, but do not expect it to last very long! These higher demand currents will cause extra loses in the internal ... more.
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