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You need both 12V without enough amps wont crank. You can't take 8 1.5v AA or a 12v screwgun battery and start your car because you need amps. most batteries have like 500cold cranking amps. the formula is amps X volts = watts or power
it takes about 1-2hp to crank a car. at 745 watts per HP +15-20% motor loss it takes around 80-160 amps at 12v to crank.
If you are trying to sneek a little more HP from your engine. Don't put in a massive sound system in and drop to a 30 or 40 amp alt. this can add up to 5hp over a 70-120amp model
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