Yeah I hope some M340i owners can confirm if this 48V issue is caused by charging when ignition is not yet off(that may explain why some are OK while others aren't).
And yes 25A likely may be stressful for 12V battery too.
My guess is that opening the hood disconnects the 48V battery/system.
Quote:
Originally Posted by anandn
I don’t know if it is needed. My car has been in storage for 2 months now in Florida and the CTEK MXS 5 shows that the battery is fully charged. It took about 24 hours to get to that stage. Last night I plugged in another CTEK charger to our Volvo XC60 PHEV and the charger is now at stage 7 (fully charged battery) after 12h.
I will know soon enough if the 48 v battery is fine or not. I believe it should be. It is a lithium ion battery and they have very low rates of discharge. Using high amperage chargers for a 12v battery seems like overkill to me. As for the sounds from the BMW, don’t quite know what’s with that unless the car is waking up every time it is approached when unlocked. Why BMW would design it this way i.e. requiring the hood to be open to charge a 12 v battery is beyond me.
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