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Installed a new, deep cycle battery (Duralast Platinum).
Old BMW battery is stamped on the terminal with "35 15" which indicates 35th week of 2015. So it was over due for a change.
Battery history (when I checked with Protool) showed the last change was done at 32k miles, I currently have it at 72k~
I was getting "high battery discharge", often, even after leaving the car on a tender over night.
No such message yet with the new battery. Fingers crossed!
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