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Hello and welcome to JustAnswer BMW,
My name is XXXXX XXXXX it will be my pleasure to assist you today.
When a new battery is installed, the vehicle is meant to be reprogramed to monitor and charge the new battery properly. This is proper BMW procedure. This has nothing to do with keeping it live, which saves your radio presets, etc and is not necessary.
The programming for the car to accept the new battery can only be done at a dealer.
With that said, I have need seen or encountered an actual problem from not having this procedure carried out.
If I were you , I would just replace the battery like you would on any other car and you should have no issue. There is no need to pay the dealer $120 to program your car to accept the new battery as the car will "learn" the new battery over a short period of time.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
It has been my pleasure to help today and I wish you the best of luck with the vehicle.
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