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Go Back   E46Fanatics > E46 BMW > E46 Convertible

E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 02-21-2009, 04:26 PM   #1
Alex D
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What battery for an e46 CONVERTIBLE!

Searched for posts on this needing a new batt for my 2001 330Ci vert but only came up with info for the e46 sedan and coupe battery types but the e46 convertible has a different size battery.

Can someone post what battery type fits the e46 convertible and where to buy?

thanks guys!
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Old 02-21-2009, 05:29 PM   #2
BodyMan
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Sorry I cant help, but I didn't know there was a difference in the vert battery. Learn something new every day.
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Old 02-21-2009, 07:44 PM   #3
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LOL, when did the vert have a different battery size?
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Old 02-22-2009, 01:02 AM   #4
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I've heard it requires a special vibration-resistant battery that is unique to the convertible body.
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Old 02-22-2009, 08:07 AM   #5
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Quote:
Originally Posted by Team_Persia View Post
LOL, when did the vert have a different battery size?
Since always. It's smaller than the coupe battery which will not fit the vert. I learned this the hard way when changing mine a few years ago. Everyone talked about the autozone batteries being decent so I picked up (IIRC) the 49DL which people used in their coupes, but it did not fit. I then had to get (IIRC) the 94 series that did.
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Old 02-22-2009, 08:08 AM   #6
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Quote:
Originally Posted by cityjohn View Post
I've heard it requires a special vibration-resistant battery that is unique to the convertible body.
You heard wrong. It has nothing to do with vibration, it's just a smaller size.
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Old 02-22-2009, 09:41 AM   #7
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It is a smaller size because the vert has a special mounting mechanism using tie rods to hold the batt .... the battery acts as a " low frequency chassis vibration" damper weight. Now don't laugh this is absolutely true!!! The battery is an integral part on the vert keeping ultra low frequency chassis tremors dampened. That is why the vert battery has this special mounting mechanism with these "tie rods" and that is only the case in the vert.
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Old 02-22-2009, 10:08 AM   #8
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I heard the vibration explanation from my BMW dealer as well. I think it is a part of the overall vibration reduction system.
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Old 02-22-2009, 10:44 AM   #9
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I wonder if the 2x4 the previous owner jammed in next to my battery helps with vibration-dampening? My battery is too small for the battery compartment and has a 2x4 jammed in there to keep it in place...
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Old 02-22-2009, 10:52 AM   #10
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Originally Posted by i_ween View Post
I wonder if the 2x4 the previous owner jammed in next to my battery helps with vibration-dampening? My battery is too small for the battery compartment and has a 2x4 jammed in there to keep it in place...
I would certainly correct that. The harmonic vibration dampening system using the battery as a weight is certainly a delicate component system in the E46 vert. The battery installation instructions in the Bentley manual explain the process of installing a battery and its not just "clamp it down".
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Old 02-22-2009, 10:55 AM   #11
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ooo, you vert owners are soo special. who cares?















jk, interesting info. gl op
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Old 02-22-2009, 10:59 AM   #12
Alex D
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From the Bentley Manual. Section 541-1:
"CONVERTIBLE BATTERY -
BMW has designed a special Convertible battery tray with link rods which serve to dampen body flexing and vibration.
CAUTION: The E46 Convertible requires a special battery which is designed for constant vibration. A battery not designed for this will fail much earlier."

My indie shop quoted me $175 installed for an OEM BMW battery ... I think that's what I am going to go with.
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1980 E21 320/6

Last edited by Alex D; 02-22-2009 at 11:01 AM.
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Old 02-22-2009, 11:05 AM   #13
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go with OEM if thats what you can find that meets the special requirements but for the love of all that is good do not pay to have it installed
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Old 03-13-2009, 10:13 AM   #14
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Quote:
Originally Posted by Alex D View Post
From the Bentley Manual. Section 541-1:
"CONVERTIBLE BATTERY -
BMW has designed a special Convertible battery tray with link rods which serve to dampen body flexing and vibration.
This sounds like nothing more than theoretical over-engineering that serves no purpose in practice. I no longer have my battery bolted down with the stock tie-downs, nor do I have a stock spec battery, and I have no perceived difference in vibration or chassis dynamics.


Quote:
Originally Posted by Alex D View Post
CAUTION: The E46 Convertible requires a special battery which is designed for constant vibration. A battery not designed for this will fail much earlier."
My stock battery, which was presumably designed as such, lasted 3 years. My aftermarket replacement, which presumably is not, has lasted 4 years and counting. So much for that theory.

Quote:
Originally Posted by Alex D View Post
My indie shop quoted me $175 installed for an OEM BMW battery ... I think that's what I am going to go with.
I paid about half of that for my Autozone replacement and have a battery with far more CCA and reserve than the OEM battery that has already outlived the one that came with the car.

Sorry, I just don't see the need to be so particular with a replacement, especially when the OEM piece seems inferior to less costly alternatives.
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Old 03-13-2009, 10:32 AM   #15
Bill W
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It is the group 94 that you need from autozone. I just replaced mine last week and autozone wanted 135 for the battery and did not have any in stock (would have taken a day to get it). So for 45 more I picked one up from the dealer.
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Old 03-13-2009, 11:19 AM   #16
Alex D
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Originally Posted by Tim30250 View Post
This sounds like nothing more than theoretical over-engineering that serves no purpose in practice. I no longer have my battery bolted down with the stock tie-downs, nor do I have a stock spec battery, and I have no perceived difference in vibration or chassis dynamics.




My stock battery, which was presumably designed as such, lasted 3 years. My aftermarket replacement, which presumably is not, has lasted 4 years and counting. So much for that theory.



I paid about half of that for my Autozone replacement and have a battery with far more CCA and reserve than the OEM battery that has already outlived the one that came with the car.

Sorry, I just don't see the need to be so particular with a replacement, especially when the OEM piece seems inferior to less costly alternatives.
It is hard for me to say why BMW did this. One thing I am sure of is that an auto manufacturer will not push up unit cost or complexity unless there is a clear need or value in doing it, whether it is product quality, features, benefits or to be able to charge more margin. I am pretty sure BMW did not install this complex design without reason ...
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1990 E30 325iC
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Old 03-13-2009, 11:57 AM   #17
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Type 94R Duralast battery from Autozone fits perfectly in the vert. I think they only make the size in their top of the line Gold Duralast. A gold Duralast 94R, with a 3 year warranty set me back about $119 last year. Fits perfectly in the clamps and the dampers connect as if the battery is OEM. The price was less than half what the dealer wanted for OEM. I'll bet the Gold has higher amp hours.

I would go with the Gold 94R. That way, you still have the harmonic damper thingy that BMW says is so important to vibration control. No wonder the vert costs so much more than the sedan. lol.

Sedan owners can use the cheaper battery, the 47DL but it will not fit in the vert. Small sacrifices!

Here is my post last year in a great thread on the battery issue. I reported then that the 94R fit perfectly in the OEM clamps, including the dampers.

http://forum.e46fanatics.com/showthr...ronsky&page=11

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Old 03-13-2009, 12:10 PM   #18
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Quote:
Originally Posted by Alex D View Post
It is hard for me to say why BMW did this. One thing I am sure of is that an auto manufacturer will not push up unit cost or complexity unless there is a clear need or value in doing it, whether it is product quality, features, benefits or to be able to charge more margin. I am pretty sure BMW did not install this complex design without reason ...
I completely agree. Unfortunately, it seems to me that this was an extraneous and overly complex design that serves no perceivable purpose other than cashing in on the proprietary replacement parts.
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Old 03-13-2009, 01:00 PM   #19
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great thread as usual here on this board. i 330ci that i've owned for 4 years with no battery trouble yet but i know its coming.
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Old 03-13-2009, 02:23 PM   #20
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great thread as usual here on this board.
Hmm, if you think that now, you really would have enjoyed it several years ago. As a guy that's been here for better than 7 years now I must say that it has devolved a bit from its beginnings. A little too much talk about lights, tints, wheels, and bumpers these days. Luckily, every thread ever created has been archived so you can find out just about anything you need to about the mechanics and technology of your e46 on this site.

Welcome!
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