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If you have a smart key, you want some extra capacity as that will slowly drain your battery. I think the stock LA is around 40 Ah IIRC with the smart key, its only around 30Ah without.
Other than that, its not a real demanding application at all. The 12V boots the system and thats about it. The DC-DC converter takes over from there and handles all the 12V stuff. The 12V is just a buffer at that point.
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