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Mine starts fine even at -25C.
330 CCA should be fine for a 1.5l engine. If you had a 3l or 4l engine then yes, you'd probably want a bigger battery.
The general rule is 150 CCA per litre for a gasoline engine, and 200 CCA per litre for a diesel engine.
When it's not so windy/rainy I'll throw my clamp meter on the battery and see exactly how much power the starter uses.
Batteries can be made with lots of thinner plates (starting batteries - higher CCA values), fewer thicker plates (deep-cycle batteris - higher RC values), or a comprimise between the two (multi-purpose batteries). The more plate surface area you have (ie:more plates) the more cranking amperage you can draw from the battery. The thicker the plates the better they can withstand a deep discharge without warping or becoming otherwise damaged.
If you have a small starting battery and discharge it to the point where it will no longer start your vehicle, you've probably caused at least some permanent damage.
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