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The stock battery is something like 48ah and 420cca or thereabouts. My ep3 currently has a battery with 45ah and 330cca. I'm looking at a 40ah Varta battery with 330cca to replace mine. It's slightly smaller in size which is a good thing, would the 40ah cause any issues? As far as I'm aware it's more to do with amp hours and leaving lights and stereos on with the engine off. Something I don't do anyway. The car is used almost every day.