I think there may be a bad cell in the battery.
It generally loses the time over night and maybe once every couple of weeks might throw up an 'Excessive Discharge' warning on the iDisplay. Might be due to the low-ish miles and not giving the battery enough time to charge up.
I'm hearing algorithms and battery registration after replacement etc and that's making me nervous.
In relation to replacing the battery, are there any 'gotchas' ?
E90 M3 S65 4.0, Silverstone II, Black Novillo, 19\" double spoke, EDC
Not that I'd heard of. I'm putting a Bosch one in based on what I've heard
On an ///M make sure it's an AGM type and needs to be registered to the car to tell it has a new one. Afaik they range from 70ah to 90ah so just replace like for like
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