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#8
07-07-2009, 01:20 PM
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The main thing to look at with aftermarket batteries is the AH rating and the RC rating. If the battery can not accept charge at the level the X5 is programmed to run it at, it will overcharge the battery causing the acid spillage as described. I know this for a fact... Not only was I trained on it, I fix this issue often.
I aggree that some third party batteries are as good as the OEM, but NOT ALL BATTERIES ARE CREATED EQUAL. Some have an identical CCA rating, but can't handle the amperage of the draw from BMWs extensive electronics, and can't handle the 120 amp or 180 amp charge of the alternator... the effect is like shoving a charge in with a funnel and a ram-rod. That is why when we change to a battery with a different AH rating we have to register it with the vehicle via coding. Just think of car audio amplifiers. Would you think a PYLE 1200 watt amp was as good as a JL audio 1200 watt amp? Don't think so. Ok, rant over... just do all the necessary research before choosing a battery. It DOES matter.
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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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