You should not have started another thread. All that has been discussed is not available in this one. You are doing everything everyone suggests and some of things you come up with. You are jumping around a given issue and from one issue to another making it extremely difficult to help.

It has been suggested several times to stick to one issue which should be making sure the battery and alternator are working properly.

If you are going to DIY the first thing to learn is to follow an established troubleshooting process, take a step by step systematic approach to find the core issue before buying parts. Second, do your own research and then ask questions here or verify what you are told here with your own research afterword. Most threads like this would have been resolved long ago.

I don't recall you saying the vehicle starts every time now? Was the battery you bought fully charged when you bought it. Have you started it up and let it idle for 20-30 minutes and monitored voltage? Have you checked for parasitic drain? Did it start and charge OK before the DISA, intake--whatever it was work? How long have you owned your X5?

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas