I would get the 'car on a lift' service light whenever the battery charge became low. I would drive the car for 60 minutes and the light would go away. I finally replaced the original battery just two weeks ago, after over 8 years of service from it. Our 2010 Z4 has only about 18k miles on it, as an aside.
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2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS, ACS springs, Kelleners wheels
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)
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