Case in point regarding the comment about damaging your alternator with a bad battery: there are no current limiting devices between alternator and battery. A battery when damaged can act almost like a dead short which will cause so much strain on an alternator it could easily destroy it.

My personal example of my "seems fine" battery that I recently replaced and tested over 500cca on a load test: after 8 minutes of hazard blinking, not only could I not start the car, my 900A jump starter could not overcome the battery and start the car.

That same jump starter started a 6L diesel truck in the dead of winter!


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)