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      09-30-2009, 12:03 PM   #133
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Quote:
Originally Posted by swamp2 View Post
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?


Its close - there's a detailed comparison here: http://www.m3forum.net/m3forum/showthread.php?t=153047
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      09-30-2009, 01:50 PM   #134
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Good info Tom. Thanks!
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      09-30-2009, 03:28 PM   #135
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Quote:
Originally Posted by tom @ eas View Post

Its close - there's a detailed comparison here: http://www.m3forum.net/m3forum/showthread.php?t=153047
But can you mount it with the stock mounting system? My guess is that with the multiple screw holes to choose from you most likely can.
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      09-30-2009, 06:35 PM   #136
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Quote:
Originally Posted by swamp2 View Post
But can you mount it with the stock mounting system? My guess is that with the multiple screw holes to choose from you most likely can.
Yes, you can use the stock mounting clamp to secure the battery in one of the other holes in the floor of the trunk.
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      10-10-2009, 01:44 AM   #137
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are there any specs on MC battery vs M3 one ?

did anybody swapped them yet?
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      10-10-2009, 01:54 AM   #138
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so it looks like MINI = CSL battery ?
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      10-10-2009, 07:27 AM   #139
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Quote:
Originally Posted by doba_s View Post
are there any specs on MC battery vs M3 one ?

did anybody swapped them yet?
E9x M3 OEM battery specs: 90Ah 1050CA/900CCA

Mini Cooper OEM battery specs: 55Ah 640CA/480CCA

In my experience, battery weight and battery power are tied together very closely. After extensive trial and error, I can tell you without hesitation that I have never found a battery with a huge disparity between these two key details that actually worked long term.

I am always amused by some of the claims made in regards to these small batteries, as each individual application has it's own unique current profile. BMW electrical systems are a very erratic in regards to a predictable/consistent current draw.The various modules in the car seem to have a mind of there own.

The reason I suggested the Mini Cooper battery to swamp2, is because it seems to be the perfectl balance between power and weight reduction. (for his application)

It suits his needs for a lighter weight replacement for the stock battery. (that has fewer downsides than the aftermarket options)

The aftermarket alternatives are a crap shoot IMO.

Having dealt with the headaches associated with this particular mod, I have acquired quite a bit of anecdotal experience in regards to these battery swaps.

The Mini Cooper battery has the nessesary size and power to work for what swamp2 is looking for, and it's also a more realistic size for the E9xM3. (long term)
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      10-10-2009, 07:30 AM   #140
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Quote:
Originally Posted by doba_s View Post
so it looks like MINI = CSL battery ?
Correct, it's a factory re-branded Exide 55Ah battery at was standard eqiupment (OEM) in the E46 M3 CSL in 2003.
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      10-10-2009, 09:04 AM   #141
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Quote:
Originally Posted by Lemans_Blue_M View Post

Here is the factory part# for the MINI COOPER (Exide) 55Ah battery:

61217571896

$176.25 list price as of 1/09
$128.00 at UnitedBMW.com...
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      10-10-2009, 09:56 AM   #142
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Quote:
Originally Posted by Lemans_Blue_M View Post
E9x M3 OEM battery specs: 90Ah 1050CA/900CCA

Mini Cooper OEM battery specs: 55Ah 640CA/480CCA

In my experience, battery weight and battery power are tied together very closely. After extensive trial and error, I can tell you without hesitation that I have never found a battery with a huge disparity between these two key details that actually worked long term.

I am always amused by some of the claims made in regards to these small batteries, as each individual application has it's own unique current profile. BMW electrical systems are a very erratic in regards to a predictable/consistent current draw.The various modules in the car seem to have a mind of there own.

The reason I suggested the Mini Cooper battery to swamp2, is because it seems to be the perfectl balance between power and weight reduction. (for his application)

It suits his needs for a lighter weight replacement for the stock battery. (that has fewer downsides than the aftermarket options)

The aftermarket alternatives are a crap shoot IMO.

Having dealt with the headaches associated with this particular mod, I have acquired quite a bit of anecdotal experience in regards to these battery swaps.

The Mini Cooper battery has the nessesary size and power to work for what swamp2 is looking for, and it's also a more realistic size for the E9xM3. (long term)
What downsides have you seen with MINI battery ?
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      10-10-2009, 02:46 PM   #143
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Quote:
Originally Posted by doba_s View Post
What downsides have you seen with MINI battery ?
Well, since these lightweight batteries are physically smaller (and less powerful) than the stock 90Ah battery, you have to manage the power drain a little more carefully.

Your margin for error is now less than it was with the factory equipped battery. So you can't make foolish decisions that can get you into trouble.

That means you have to monitor your usage when the key is off, and make sure you don't leave anything on inside the car that can drain the battery.

Many plug-in accessories will do this, as will listening to the radio/CD etc. with the engine off.

Regardless of which size battery you choose, you must be vigilant in keeping a tight reign on your current consumption. (the part YOU can control)


The Mini battery allows you a more comfortable margin of error between the 90Ah stocker, and the lightweight 20-30 Ah aftermarket alternatives.
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      10-11-2009, 12:57 AM   #144
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O yeah,

I am on top of that haha ...

You should see my fiancee, she is turning everything off before she leaves the car ( radio, heater/ac, unplugs charger, turns off V1, even turns the light switch from "auto" to off haha ) so, every time I get into my car after she was driving I feel like I am in brand new vehicles and everything needs to be set up again ... :d

Quote:
Originally Posted by Lemans_Blue_M View Post
Well, since these lightweight batteries are physically smaller (and less powerful) than the stock 90Ah battery, you have to manage the power drain a little more carefully.

Your margin for error is now less than it was with the factory equipped battery. So you can't make foolish decisions that can get you into trouble.

That means you have to monitor your usage when the key is off, and make sure you don't leave anything on inside the car that can drain the battery.

Many plug-in accessories will do this, as will listening to the radio/CD etc. with the engine off.

Regardless of which size battery you choose, you must be vigilant in keeping a tight reign on your current consumption. (the part YOU can control)


The Mini battery allows you a more comfortable margin of error between the 90Ah stocker, and the lightweight 20-30 Ah aftermarket alternatives.
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      10-12-2009, 01:34 PM   #145
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Quote:
Originally Posted by Technic View Post
$128.00 at UnitedBMW.com...
Mail order or in person? Buy on the web or call? Are you sure on the pricing, very low?
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      10-12-2009, 09:20 PM   #146
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Quote:
Originally Posted by swamp2 View Post
Mail order or in person? Buy on the web or call? Are you sure on the pricing, very low?
That's online price at either United BMW or at Tischer BMW...
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      10-12-2009, 10:36 PM   #147
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Quote:
Originally Posted by swamp2 View Post
Mail order or in person? Buy on the web or call? Are you sure on the pricing, very low?
it is a good price, but you would have to pay for shipping ...
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      10-12-2009, 10:43 PM   #148
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so is the braille battery crappy? I want to switch out my stock battery in my e92. So is everyone feeling the mini battery is a better choice?
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      10-12-2009, 11:09 PM   #149
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Quote:
Originally Posted by second_2_nun View Post
so is the braille battery crappy? I want to switch out my stock battery in my e92. So is everyone feeling the mini battery is a better choice?
Braille is a good battery but not the best choice for this application
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      10-12-2009, 11:10 PM   #150
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Quote:
Originally Posted by doba_s View Post
Braille is a good battery but not the best choice for this application
so to save weight its better just to go with the mini battery?
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      10-13-2009, 10:56 AM   #151
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Quote:
Originally Posted by second_2_nun View Post
so to save weight its better just to go with the mini battery?
no one done this yet, but it looks like it should work ok and save some weight ...
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      11-14-2009, 11:10 PM   #152
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Quote:
Originally Posted by Lemans_Blue_M View Post
Yes, you can use the stock mounting clamp to secure the battery in one of the other holes in the floor of the trunk.
You are a genius!! The Mini Cooper, aka CSL Battery was a direct bolt in, fit like OEM, perfect fitment! My Braile LW battery would always go out on my VFE SC'd E46 M3, so the MC/CSL battery was a good compromise. Turned out to be about a 24 lbs. weight savings, not too bad for 130, bucks. I will post pics soon, really appreciate this post - doba, Lemans and everyone else. Thank you!
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      11-16-2009, 01:27 PM   #153
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Quote:
Originally Posted by DLSJ5 View Post
You are a genius!! The Mini Cooper, aka CSL Battery was a direct bolt in, fit like OEM, perfect fitment! My Braile LW battery would always go out on my VFE SC'd E46 M3, so the MC/CSL battery was a good compromise. Turned out to be about a 24 lbs. weight savings, not too bad for 130, bucks. I will post pics soon, really appreciate this post - doba, Lemans and everyone else. Thank you!
Add the Z4M into the mix, it uses the same battery.
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      11-16-2009, 02:46 PM   #154
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Quote:
Originally Posted by tom @ eas View Post
Add the Z4M into the mix, it uses the same battery.
Good info as always Tom.
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