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jeeze, 30ah? Seems really small. I just swapped in the old battery from our X5, which i think is 100ah, because my 330i couldn't run the radio for more than a couple minutes with the engine off anymore - and the fan was starting to run crazy at low speeds due to lack of power. I knew the battery was on it's way out for a while (measures consistently under 12v) but the fan not running properly was the last straw, especially when I want the AC to be functioning.
But damn, is it heavy. The hardest part of swapping it was muscling it in place without damaging anything.
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