It is interesting that your vehicle is 2011 X5 and they still put a non AGM battery in it. In my case the battery could not hold the charge so dealer replaced it with AGM battery. No more battery warning despite short trips.
What I notice is even if you don't drive the vehicle hard the engine is quite hot after 30mins of driving. I hear something running under the hood after I turn off the engine. It sounds like the fan but it could be the coolant pump and it stays on for a while.
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