2001 BMW 325i Q&A

2001 BMW 325i Question: Battery troubles

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? -
Answer 1
Got to have it tested! Take it to a repair shop for this. -
Answer 2
have battery tested 1st,if alt bad i believe it wuld have died sooner -
Comment 1
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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