Well I had a the battery load tested this morning and it failed....New Decka gold maint free lead acid ,not AGM the battery specialist by me recommended.. 900 cranking amps.

Exact fit with batt overflow hose. 649MF $157.00 out the door installed.

Whats weird was I told him to put a batt in the cig lighter to keep all memory...he said not necessary and told me to start the car and he switched the battery with the engine running. Poss discontented first and positive installed first and it worked like a charm....no nasty lights. He said he does 100's of them like this without any issues. He said on the German cars you have to start them at least 3 months or the battery will start to go bad if your storing them..not on a maintainer. This one had a 2 year old Decka AGM in it before I bought it but it sat for one year dead. The charging system passed fine with my volt meter as well as the test to the battery with the engine off. It read 12.4. I did not have a load tester...the car with the old battery started every time and came to a full charge with the battery charger....I guess the German cars are very sensitive to voltage changes and the car knew the battery was starting to go. But to let you know the batt or alt is going bad with "trans fail safe prong" message is stupid"

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2002 X5 4.4i Sport Wheels
2014 X5 35i M Appearance & suspension package
1995 Porsche 993
1972 Porsche 914-6
2020 GLE 450 Twin Turbo
2019 Alfa Stelvio 500hp Quadrifogilo
Many motorcycles