This has happened to me twice within last week. When I started the car on Thursday last week, it cranked then stop so I turned the key back to off position and start again which is find the second time. The same thing happened on Saturday's afternoon. Any one having this issue? Is my battery about to go out? She is now 85,500 miles

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2003 X5 4.4i w/ Sport Pkg, Cold Weather Pkg.
2010 X5 4.8i w/ Sport Pkg at 19,000 miles