the previous poster knows a lot more about electronics than i do,so that's good advice.i would say that if it's the original battery and it's having those symptoms,it's probably time for a new one.the previous owner of my car had the clock slowdown,and got a new battery at 4 years.that fixed it.4 to 5 years is about as long as i would expect these batteries to last with the amount of electrical drain on these cars.
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2OO8 E90 M3 /// INTERLAGOS BLUE w/BAMBOO BEIGE, CARBON LEATHER / 6MT / 19" 220M FORGED WHEELS / PREMIUM / MOONROOF / IPOD / BSW SPEAKERS
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Last edited by robbiedawg; 11-09-2012 at 12:15 PM.