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Message: <blockquote data-quote="helotaxi" data-source="post: 3044059" data-attributes="member: 550915">If you crunch the numbers the theorectically usable storage capacity of a car audio capacitor is right at 0.5 amp*seconds of current per Farad of capacitance.  Not a lot at all.  Subtract losses from resistance and you're looking at right at zero usable capacity.  A battery on the other hand measures its capacity in the amp*hour range and resistance is already accounted for.  It's capacity is all usable.In theory they do the same thing, but the application makes a huge difference.  The run cap is a high voltage low current device.  The low current is key because the current through the resistance is what causes the loss.  A car cap is a low voltage (working voltage range is around 2 V) high current device and poorly suited for that purpose.</blockquote>

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