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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > optima battery



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      09-23-2011, 05:04 PM   #1
klaudio
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optima battery

my battery is about to die so i need to change it, and i was thinking in replacing it with an optima battery but i do not know with one to use yellow blue or red, does anyones here have some experience with it???


thanx


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      09-23-2011, 11:04 PM   #2
Brian_TII
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IMHO they aren't that amazing, and they really hate to be discharged at all. Ive ruined more than i can count. I'd just use the BMW battery.... They last a long time and are priced similar.
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      09-23-2011, 11:41 PM   #3
Glim
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Use the exact same Amp Hours and type unless you want to pay to have it coded, if you are getting it coded go for a 90AH AGM. If you are replacing it yourself make sure you plug the unused vent hole and vent the rear facing vent hole with the tube you pull off your old battery. We have seen a few battery related trunk fires lately which totals the car.

Accepted normal batteries coded: 46AH, 55, 79, 90 and 110.
AGM that can be coded: 60AH, 70, 80 and 90.
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      09-24-2011, 12:42 AM   #4
lbernielu
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Group 49 90 ah AGM (Deka exact fit replacement) is what I got, and had it registered. Battery costs about the same as Optima, but is one third bigger.
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      09-24-2011, 08:40 AM   #5
ceb
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ONNABT - oh no, not another battery thread.

OP - do a search on battery and registration. That should explain to you what you need to do to change your battery in general. One you've read those threads you can re-ask your Optima question if you still feel the need.
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      10-05-2011, 09:54 AM   #6
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I tried a lighter battery

I went with a lighter battery, then I realized that BMW balanced the car perfectly and that I couldn't possibly do a better job. If your dragging in a straight line then dropping the weight makes sense. But for a supped up dd, if you drop the weight in the back, over the drive wheel, you lose traction.
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