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06-03-2009, 04:34 PM | #111 | |
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That's the same conclusion I eventually came to after four years of trial and error. Given my infrequent use of the M, I should have conceded this a long before I did. Just being hard-headed I guess. The 'math' you mentioned is what got me too. It was 'supposed to work', but at the end of the day...they all underperformed. It certainly would have saved me a lot of time, money, and aggravation... ...if I had stopped looking at the specs, and solely concentrated on the real world performance limitations for my application. I ended up buying a somewhat larger automotive STARTING battery that had a 44Ah rating. It was a godsend, compared to all the headaches I had with the small lightweight batteries I was constantly trying to use. There are a few batteries that I found, which might be perfect for you. Given your infrequent driving pattern, a slightly larger battery will work out much better than the Braille battery did. You were on or slightly under the breaking point for the M3. (for a non-daily driver) Let me know if you're interested, so I can point you in the right direction as to the best available options in this new (more realistic) Ah range. |
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06-03-2009, 10:25 PM | #112 | |
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It would be great for you to make some suggestions about alternatives. We will all benefit from that and from your experiences. You are aware of the large physical size of the OEM E92 batter right? |
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06-03-2009, 10:41 PM | #113 | |
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We're using the 21lb Braille in our M3 and 17lb in our 1-series project, the 1-series is a daily driver with no problems, the M3 needs to be started up about once a week. Smaller batteries simply have less reserve capacity at a cost of shaving weight - drive often.
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06-04-2009, 02:48 AM | #114 | ||
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06-04-2009, 01:44 PM | #115 | ||
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80% is simply the number BMW chose and used as a reference point. Quote:
Our MY08 M3 is fully loaded w/ sunroof, including Sirius, Bluetooth, Comfort Access and other devices (for datalogging and other testing which communicate via CAN). If there is a potential issue - I want it happening to our car first since its rare that cars break down in driveways. I'm also using the B2131. Our 135i project uses the Braille B2317 unit and is a daily driver, but the B2015 would give occasional "low battery" lights from time to time with no issues on cold start up, possibly related to battery registration. 2 days is a suspect, I have no issues as long as the vehicle is driven at least one a week. However, it should be known that a race battery cannot simply be held up to the same expectations as OEM on CCA/reserve capacity. My situation is not saying one or the other is wrong or right - just simple reference. Hope this helps.
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06-04-2009, 02:18 PM | #116 | |
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06-04-2009, 02:34 PM | #117 | |
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PM me any questions you might have and I'll be happy to ask for you, or I can forward him your contact info.
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06-04-2009, 03:05 PM | #118 |
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My suggestions was to check for an electrical draw or to make sure all modules are going to sleep after 20-30 minutes. I am suspecting an electrical draw causing the issue(s).
There are other M3 owners with the same set up you have and have obsolutely no issues. We need to find the source of the problem. Our shop vehicle has a B2015 in it, and a 2 week storage period yields no problems and the vehicle starts just fine. |
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06-05-2009, 05:43 AM | #119 |
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So the various experiences reported in this thread demonstrate a diverse set of outcomes, and it sounds like different driving patterns and cars (configuration and maybe software) limit our ability to conclude much other than the observation that the B3121 might be sitting on a gray line when used in the E9X M3. I might still give mine a try, but if I do, I will be carrying a battery charger around with me before I am convinced that it is working for me...
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06-05-2009, 01:30 PM | #120 | |
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07-17-2009, 04:27 PM | #121 |
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A long overdue update. I hooked up with Harold from HP at the So Cal Euro event and he did some "resetting" of the battery/charging profiles using a laptop and Autologic (or GT1) tool. Since then my car is behaving normally and I am not experiencing ANY flaws, bugs, downsides, etc. from my Braille battery. I can now leave the car unused for multiple nights in a row as well. This leaves me with the comfort that the specfications are in line with the batterys actual performance. If you recall there was much prior discussion in this regard - the batteries specs seemed to be inconsistent with its behavior in my car.
Anyway thanks again Harold. The Braille 3121 has my full endorsement for a warm weather M3 application, regardless of the vehicles options. Lucid: Any update on your installation?
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07-19-2009, 03:31 AM | #122 |
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I am surprised a bit people have some issues with the Braille Battery.
I have had a Brailly B2015 in my Z4M coupe for year and had no issues what so ever. It always started, also after 3 weeks of not using, and also in cold temperatures here in Switzerland. Maybe the differences with the E9X is the amount of electronics in the car... |
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07-19-2009, 12:09 PM | #123 | |
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Good info ... |
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07-19-2009, 01:50 PM | #124 | |
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07-21-2009, 06:50 AM | #125 |
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08-25-2009, 11:21 PM | #126 | |
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08-26-2009, 12:37 AM | #127 | |
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08-26-2009, 01:17 AM | #128 |
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Sorry I did not make that clear. It did being its usual misbehavior before the 2 week idle period. That is, it was "forgetting" the date and time combined with periodic low charge warnings.
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09-30-2009, 02:23 AM | #129 |
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Just to close the loop here - a brief update. I finally went back to my stock battery. I had a low voltage warning until my first long-ish drive. Since then it has been gone and there are NO problems with CA nor with the date/time memory. Problem cured as I much suspected it would be.
Does anyone know of a battery by BWM or their battery supplier that is lighter, the same form factor and about 60 Ah or so. This would be a great replacement for those of us in warmer climates looking to save weight without any reliability problems.
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09-30-2009, 07:54 AM | #130 | |
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I would suggest a battery used in the MINI COOPER. (BMW satellite brand) It's rated at 55Ah's, weighs approx. 35 lbs., and it's BMW OE quality. You are looking at approx $190 /w/ tax depending on where you buy it. Here is the factory part# for the MINI COOPER (Exide) 55Ah battery: 61217571896 $176.25 list price as of 1/09 I suggest this for quality (proven OE performance), convenience (available at any mini dealership in the country), and the light weight package. I used this battery with great results in my E46 M3 for nearly 3yrs. without any memory/charging issues. I strongly recommend that you consider this route, as you won't find many other viable alternatives. (despite all the marketing claims out there from a variety of aftermarket lightweight battery companies)
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09-30-2009, 11:58 AM | #132 |
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Great suggestion LMB, it is the same size at the OEM battery? Or of a size that mounts using one of the other available mounting holes in the E9X M3?
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