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As I have posted before, I use a portable voltmeter to check the charge rate. It has been a consistent 13.7-13.9 volts since the car was new. When I have to replace the battery I will check to make sure the charge rate is the same. If not, I will probably have it registered. It will be a cold day in hell if I ever pay $400 for a battery for a BMW or any other car when I can buy one from Auto Zone or Walmart for $77.
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