Car should sit at 12.2 or more, maybe 12.6 or 12.7 when fully charged and happy. If there is a decent enough parasitic load then it will certainly go lower than 12.2 with time. You can't beat physics.
Ok guess I can rule out the battery, probably even the starter and alternator (maybe) as well. I'm gonna clean those leads and see what happens if it's still shit I might take it to an auto electrician. Unless the immobiliser is that f**king heavy, but it shouldn't be.
If I start the car every day, starts up perfectly never an issue.
Isn't 12v low, shouldn't it be around 12.5v?
Anything above ~9.5V is acceptable. The higher the better, but it will almost always drop to at least 10.5V, if not lower, even with a new big battery and everything else being good.
9.76 is not a concern. If it goes below 9, you'd be sure that there's a problem with either the battery or the connections.
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