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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Battery replacement question in 335d



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      06-22-2014, 08:48 AM   #1
bballfreak
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Battery replacement question in 335d

Is it OK to replace my OE lead acid battery with a Mercedes AGM battery
100 mAh and 900 CCA? My MB friend got it for $171
The OE is 90mAh and 720 CCA.
Does the Toolset32 provide provision to switch to AGM 100 mAh?
Also AGM does not need a vent?
Any suggestions? as my OE battery is going south almost after 5 years.
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      06-22-2014, 08:53 AM   #2
135i_vs_
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How do you plan to code this battery?
If you don't code it, possible to have all sorts of electrical issues, things not functioning right.
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      06-22-2014, 08:56 AM   #3
bballfreak
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Quote:
Originally Posted by 135i_vs_ View Post
How do you plan to code this battery?
If you don't code it, possible to have all sorts of electrical issues, things not functioning right.
Code it with toolset32. That is why I was asking
If there is a provision for AGM 100 mAh battery
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      06-22-2014, 05:09 PM   #4
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No there's only a 90 or 92Ah setting for AGM. There's a 110 for lead acid I believe. As long as that battery fits, you'd be fine to code it as a 90ah AGM.

I would check fitment because the 90Ah AGM barely fits; fitment was the hardest part of the job, specifically working with the mounting bracket.

Finally, the AGM does need to vent. There is a vent tube which connects to a vent port on the side of the battery.
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