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Yes I do, and I expect it to be completely dead in 3 days. However they can be charged up very quickly from a very small capacity battery (it does not hold too many Wh but it is enough to crank the car a couple of time).
A capacitor is like a mini battery that can deliver all of its charge, i.e low voltages does not stop it delivering amps, and it does not get upset if the voltage falls too low.
The advantage would be that over the long run it does not have so much loss. i.e you start your car and it thinks you have a full battery in a couple of seconds.
I plan on doing this with my car but I fear that the modern charging algorithm may be confused with what is essentially a much smaller battery.
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