Quote:
Originally Posted by theholycow
AFAIK, the huge capacitors used for automotive stereo systems are mostly worthless (like ricers with big wings). In some cases they are worthwhile; such cases would be the cars whose headlights you see dimming to the beat -- every time the bass plays, the lights dim.
A capacitor is a short-term, low-capacity electric storage device. It holds a little bit of power, and releases it very quickly when needed. That's all. It won't help make a battery last longer after shutting the engine off.
If the charger is putting out as much power as the stereo is using, yes, it will work.
There's also the second battery idea, or just watching the volt meter and starting the car before it runs dead.
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Complete and utter truth, with some unvarnished opinion. YES they are used when they are not needed a lot, BUT they do serve a purpose and used properly will improve a systems performance.