So my CEL went on on Sunday, just one day after very long trip (270 miles, last 130 of which were non-stop). The battery was suppose to be charged after that long trip, right??? Well, not so !

It all started with CEL turning on, and some engine sputtering during startup. Sure enough, monday morning 7am I am at my dealer (I just showed up without an appointment)... They hooked it up, and saw a few issues:

a) Bad camshaft position censor (which I guess explains sputtering)
b) "Unfavorable driving condition" - low battery charge. The car starts up fine, but they cant re-charge battery above 40% - it just would not accept charge.

Have to admit, my wife was driving the X for the past 5 weeks, mostly very short trips (1-3 miles each), and weather was cold. So the battery went bad... They swapped the battery, also thinking that low voltage was causing some issues with the camshaft sensor... Apparently sensor was bad too, not sure if the two were related.

My SA made an interesting statement... Apparently with these batteries once they go very low, they will never re-charge to 100%... Dont know if I should buy this BS...

Anyway, this is my 2nd battery replacement...

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive