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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Mar-18-2017, 10:56:07 PM   #1
tripalthreat
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Default Lightweight battery question

I'm installing a lightweight battery in my 2004 m3. I need to use adapters to convert the M6 terminals on the battery to posts.

I bought some but the negative post is too small (I couldn't get the clamp on the car wire to tighten). The positive is fine.

For anyone who has done this, do you know the exact brand you used that worked? Or any tricks? I ordered another brand but don't want to keep guessing.
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Old Sat, Mar-18-2017, 11:38:15 PM   #2
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Default Re: Lightweight battery question

Just did this last week. I switched the terminal adapters from side to side and they fit better but the positive was still a little off. So sanded down the shoulder on the terminal and now they fit perfectly
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Old Sat, Mar-18-2017, 11:54:02 PM   #3
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Default Re: Lightweight battery question

Most automotive places usually have some on the shelf. I think I bought a set that worked at Riebes (Napa Auto Parts)
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Old Sun, Mar-19-2017, 11:49:56 AM   #4
tripalthreat
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Default Re: Lightweight battery question

Thanks. The only place I've found ones with M6 threads is online. And my Deka def has that. I wonder if I'll need to stretch the negative cable and use two of the bigger positive posts...
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Old Sun, Mar-19-2017, 04:34:06 PM   #5
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Default Re: Lightweight battery question

This is what I use real battery very light and reliable
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Old Sun, Mar-19-2017, 05:23:06 PM   #6
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Default Re: Lightweight battery question

Yea, thought about that one. But my biggest reason for changing was AGM not size/weight. I have no rear seats and was told some HPDE clubs will not pass tech if you have and old school battery and no trunk separation.

Went with this:

http://www.etx30l.com/


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Originally Posted by Argentic View Post
This is what I use real battery very light and reliable
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Discussing Lightweight battery question in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)