Quote:
Originally Posted by Billfitz
The battery is long in the tooth, but if it's a charge problem that's going to be evident mainly when first starting the car, not when you're on the highway at 70.
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Batteries can fail at any time, and he is a good case in point.
BMW batteries are not constantly being charged by the alternator, so they can fail at any point as it doesn't have a steady power supply going to it. Any decrease in the nominal voltage will shoot up errors instantly.