Bumping this up to the top as looking to get a charger for the M850i just to rule out low lithium battery levels for OTAs. Planning on going with the CTEK OEM'd BMW battery aka 4961 (
https://www.shopbmwusa.com/PRODUCT/4...TERY-CHARGER). $163 and a fractional rounding error of chump change given the time and investment with the M850i.
Are there other recommendations? There has been several threads on 1 battery vs 2, etc. Best trickle chargers for the single lithium in a M8, but I'm pretty confident my 2020 M850i has two batteries, i.e., AGM and Lithium. Any recommendations beyond the BMW charger?