Hi, further revival of an old thread. With the recent cold weather I'm getting a battery warning on my 2018 M2 - even after a couple 30KM trips earlier today. Seeing lots of threads for battery tenders and wondering which CTEK model people are recommending? I don't see the MUS 4.3 on the CTEK website and according to Amazon the MSX 5.0 is the newer model. My car is parked outside so not sure if that impacts the decision? Or should I simply get the OEM charger which is a CTEK?
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