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I used a large capacitor on my car (a 2 to 3 Farad cap), because in Florida, car batteries generally last 2-3 years tops.
It definitely helped starting on a low charge.
However if the car stands still too long, those large caps do drain the battery.
Even small banks of caps do.
But if you drive it daily, I see no reason why not to install one of those 3 to 5 Farad caps they sell for audio equipment for like $25-40.
Generally 2-3 Farad is more than enough.
Strangely enough, my car didn't give me an indication anymore when the battery was needing replacement due to the cap. Perhaps it thought there was plenty of power left in the battery?
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