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BMW 5-Series (G30) Forum 2017+ BMW 5 Series (G30) General Discussions Battery Charger

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      01-18-2021, 06:45 AM   #1
Dephead2004
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Battery Charger

Has something changed in a software update for my 2017 (MY2018) 520i SE? It has an AGM battery that I used to hook up to a CTEK charger once a year in the winter to top it up.

This year the car keeps switching itself off after about an hour and so the charger resets.

I use the underbonnet terminal and have tried 3 chargers. All do the same thing.

How do you ever get a full charge?
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      01-21-2021, 01:40 AM   #2
turbobeagle
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Coincidentally I just used a ctek on my 2020 540i last night. This is the first time. I’ve used it since getting my software upgraded for Android Auto. It did get to stage 7, or the one with a green light on it. I think that’s the float stage. So it did seem to complete.

One thing that was odd though is that the killawatt meter the charger was plugged into still showed a draw of 60 watts which hasn’t been the case in the past. Normally it’s just 1 or 2 watts when it gets to that stage. I didn’t know what to make of it, I just figured maybe it cycled up to top it off again at the time I happened to check it.
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      01-21-2021, 01:45 AM   #3
Dephead2004
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CTEK said that the charger was faulty and suggested a return under warranty but as it is 8 years old that is not on. No special deal either.

However, I used an old standard charger and got a charge going. Then I was able to use the CTEK in recon mode as usual.

Hope this helps fellow chargers.
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