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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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you might have something draining down the battery which could lead to making your battery go bad - batteries don't like to be charged, drawn down, charged, etc.
have your alternator checked - bad diodes can run a battery down.
have your battery checked out at the same time - chances are it is bad.
a lot of car parts places will check battery and alternator for you free of charge.
if you replace your battery and it goes dead on you again, then you also might have some sort of electrical problem else where that is draining your battery.
You didn't list your car model but if you do a google search - you might find some more answers. For instance - if your BMW is an E34 - google "battery drain e34" - you'll find links back to this forum as well as others.
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