Hi don't no about the 2012 model but my 2005 l322 definitely does not gave an aux battery, the electronics in the l322 are very sensitive to a low battery and will come up with all sorts of faults, normally eas or abs but have heard of many different ones best advice is to get a smart charger and recharge the battery, chargers range from about £50 to a few hundred and will normally take 8 to 12 hours. You can try a normal charger but I got best results out of a smart charger
As a matter of curiosity did the issue happen with your new battery or not found out yet ? I'm going to look later this afternoon and see what the battery tells me....
I'm not sure I get the relevance of the charger ...?? If a smart charger adds a slightly higher float voltage, it'll disappear the moment the engine starts and its back to the alternator voltage ??
Can't explain the technical reasons why as don't no, but I can tell you had many problems with my car over the years and many were to do with low battery readings so I paid out brought a ctek smart charger and have only had to use it twice in the past two years once when I brought it and once after the garage left ignition on and run the battery flat , they did recharge it but had many phantom faults popping up so got the smart charger put left it over night and no problems since, I do understand what you are saying by once the engine is started it should not make a difference but I have found it does cant tell you why . Before anyone says yes I have checked the alternator and that's fine, but one thing I have learned over the passed fea years is battery condition on the l322 is always the first thing to check
Hi this might explain a little more in detail
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