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Q: Battery troubles on 2001 BMW 325i

My battery died last week when it was really cold. I charged it up and 5 days later it died again. How do I tell if it is the alternator or ecu?
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Well, I went to local parts store and I didn't know they could test alt with the alt still in. Alt is good battery is bad. Also didn't mention the heat went out after I jumped the battery. That's why I thought it was the alt.
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