Quote:
Originally Posted by Piwoslaw
The alternator sucks up lots of engine power, producing more electricity than the car needs.
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Incorrect - the alternator only produces as much electricity as is needed... No more, no less.
The power is sucks up from the engine is the amount of power needed plus alternator inefficiencies.
And as already stated, your alternator does not start your car
Exceptions for a few vehicles that use starter generators...
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Spiral spring.... you probably mean power spring, like what's found in a seat belt or clock. You'd need one helluva spring - that's a lot of energy stored... And as said, it'd be quite heavy. Impossible? No... But as said, a battery has a much better energy density.