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Originally Posted by Fuzzy Master
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Thanks! Agree with everything MystroX5 posted - modern electronics in cars - and modern meaning anything with tech in the last 5 years or so - puts a drain on batteries that wasn't there 10 or 15 years ago, even garaged and turned "off." I suspect a marginal battery may be the cause of a lot of electronic woes posted here. We have continually charged/topped off our 2018 Q7s and previous X5ds, both power-hungry beasts, and never had any kind of battery issues or error flag pop up. Still getting familiar with the new BMW system, but if it indeed has dual batteries, it may even be that they are somehow mutually supportive, and charging one will help the other. The trickle chargers I have are rated for Li-Ion batteries as well as standard, so I'll get with our SA and see what they recommend. I noticed all the showroom Xs in our dealership were hooked up to tenders....