No you seem particularly incapable of getting it. If you did that the optima would light the lights brighter and for longer and be more dead at the end of it that an inferior standard starter battery due to the fact that it has lower resistance.
However if you compared it to a stock nasty starter battery at say 90 percent discharged it could still start your car. Where the nasty battery would most likely fail even if nowhere near this discharged due to its higher internal resistance.
We can go on forever if you want. You obviously have no clue about batteries.
Yep!
when
Yep.
A larger tank holds more petrol - but
Yep. But with a crappy low tech battery the tank can still be half full and the car wont start since its internal resistance wont dump enough current without voltage drop to do so. This is where your attempt at an anology fails. However an optima or almost any AGM battery can do the same trick even when all but empty.
This means that your cheap battery must have double the "capacity" to do the same trick. And I bet you STILL dont get it.
I am wasting my time.
Standard starter batteries are lower in CCA anyway than an equivelent AGM or optima. It would spin that engine over at that voltage without trying. The stock battery cant due to the fact that its internal resistance is such that its voltage drops at these high current levels while trying to crank to the point where it wont start.
Its "fooked" in your words presicely because of the fact that the cars electrics have caused it to lose capacity and cranking amps because standard batteries dont like being discharged much without losing active plate material and the original CCA has deteriorated.
Hence an optima or hawker replacement BECAUSE ITS BETTER!!!