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You could be on to something StatenEye....
I bit the bullet and just changed mine at the dealer (2013 X6M - garaged in winter)....Besides the warning message (last two winters), what prompted me to change was noticing all seat/mirror setting had changed...and I didn't want to cause unnecessary damage elsewhere (i.e the alternator). I was using a NOCO trickle charger.....I wouldn't recommend the Genius chargers (the on -board seem ok) as the wires are crap in freeze your ass off conditions...
We also have a 2015 X3.....reported a "Battery Discharged - Start Engine" warning this week. Charged it up...and decided to install a NOCO on-board charger....this vehicle sits outside year round.
But my sons 2008 323i is still going strong on the original battery....probably jinxed that...but gave it a charge for good measure. This vehicle also sits outside.
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