True, but bmw key recharge batteries from back then do have a life span and we are talking over 20 years. Not difficult to replace the battery either. If you can get a new one then you do feel good about it and never have to worry about it for the rest of the lefe with the car. Especially if you are in your 60’s/70”s.

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2005 X5 4.4i M Sport
2003 X5 4.4i