18.5kg, wow that's a heavy bugger. Most ECU will have a limit to the amount of amps the engine pulls anyways, so in theory, a 730CCA battery won't start the car any better than a 430CCA one. Have you found it to be any different?
CCA isn't really necessary, but higher CCA usually shows a larger amount of Acid / Lead which in turn is not taxed as hard and could lead to a longer lasting battery.
It is however very useful in listening to music when the car is turned off and you may see a lovely 4 gauge wire leading it's way to the back of the car.
Hopefully in the next few months that will be replaced by a 2 gauge or 0 depending on just how much money I drop on amps/subs!
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