I only used AGM with my e53. I never charged other than driving.

When the battery i bought with the car failed, the failure mode was that it had plenty of current to crank but no reserve: 8 minutes of hazards meant i needed a jump start.

You kept saying battery died battery died. You just mean it was drained flat? If the car off drain is excessive def track that down. It should handle 2–3 weeks standby.


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)