2002 X5 Help

[alan5251]

Hi, I have a an 2002 X5 3.0D and if left for a period of around 4 days the battery becomes flat, this has been going on for a few years now, I have a garage myself and I have done all the neccessary checks

No drain
Good battery
Correct charging rate

But the cranking amps seem to be high at 430, does anyone know the correct cranking amp for this particualr model? Or any other ideas what the problem could be i'd be most grateful, thanks