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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 12-23-2005, 11:55 AM   #21
kbsilver
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Believe the 49D AutoZone battery is longer

Believe you will find the AutoZone 49D 1.5" longer, and 0.5" shorter than OEM, but not to worry.

From what I unsderstand the battery tray is adjustable to handle the longer battery. Also the battery is mounted from the tabs near the bottom, so the fact it is not as tall does not matter. It still has more capacity than OEM.

I have been told that the 94R is the exact same size, but also costs $20 more.

My car is almost 6 years old with original battery so do not have this experience yet. I expect will be going thru it soon. Not that it matters, never added any water (never checked it for that matter) as still runs perfectly. (Great, just jinxed myself).
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Old 12-30-2005, 09:32 PM   #22
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Quote:
Originally Posted by ProV1
Is the Autozone 49DL a PERFECT fit in the E46 trunk? Are the height & width identical to OEM?
Just put one in my Dad's E39 today, and it fit every bit as well as the OEM. It even comes with a small adapter kit to make the vent hose work.
Should be the exact same story for the E46.
And the dimensions seemed identical to OEM when we compared the two side by side at the store.

To reference the above post, I'm pretty sure the 94R is about an inch or so shorter length wise, and puts out less juice.
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Old 12-30-2005, 09:59 PM   #23
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When removing a battery the rule of thumb is:
Remove Negative first positive later.

When installing a battery:
Positive first negative later..

..unless you wanna shock yourslelf
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Old 01-30-2006, 10:57 AM   #24
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Good info here. saves me the trip to the dealer. My OEM battery just died on my 00 328. to autozone I go!
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Old 07-24-2006, 01:15 PM   #25
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I've had my car since november 31, 2001 with currently 45,500 miles on it and I suspect the battery is done. is that about right 4.5 yrs, 45k mile?
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Old 07-24-2006, 01:17 PM   #26
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Quote:
Originally Posted by bender
I've had my car since november 31, 2001 with currently 45,500 miles on it and I suspect the battery is done. is that about right 4.5 yrs, 45k mile?
If you live in Houston it's a good possibility. When I lived there my cars seemed to eat batteries like crazy. The heat is hard on them.
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Old 07-24-2006, 01:18 PM   #27
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and the dealership wont cover the battery under their 5 yr service warranty? they said they cover everything, even windshield wipers..... i guess a $100 part is considered along the same lines as gasoline when it suits them

Last edited by bender; 07-24-2006 at 01:21 PM.
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Old 07-24-2006, 02:05 PM   #28
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Originally Posted by bender
and the dealership wont cover the battery under their 5 yr service warranty? they said they cover everything, even windshield wipers..... i guess a $100 part is considered along the same lines as gasoline when it suits them
Isn't the maintenance service coverage 3 years or 36,000 miles?
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Old 07-24-2006, 03:10 PM   #29
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convertible has different size of battery compare to coupe
am i right?
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Old 07-24-2006, 03:57 PM   #30
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convertible has different size of battery compare to coupe
am i right?
That is correct. Convertible battery is physically smaller, it's a 94R if I remember correctly.
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Old 07-24-2006, 03:58 PM   #31
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Originally Posted by HOMEP1
Hey, I'm not car inclinded, but I would like to know how I can replace my own battery (without going to the dealer). Assuming I buy a Duralast 48 or 49 DL at Autozone. If anyone has the instructions, or just a pointer, please let me know. Thanks...
The hardest part is finding it...
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Old 07-29-2006, 12:01 PM   #32
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what is the purpose of the vent hose thingy? The battery seems to work fine without it? should i bother connecting it? (with the adapter from the ds-49)
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Old 07-29-2006, 12:03 PM   #33
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takes 10mins tops
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Old 07-29-2006, 01:08 PM   #34
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takes 10mins tops

i'm well aware i just wanted to know what it actually does? plus i have some extra wires around from my ice so it is actually a pain for me to take all that **** out....I just wanted to know if it was imperitive to connect the hose?
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Old 07-29-2006, 01:19 PM   #35
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I can't say for certain, this is heresy from what a guy at Advance Auto Parts or Auto Zone whatever said, but...

Supposedly the vent is there to, gasp, vent the gasses from the battery to outside of the car. When a battery is placed under the hood there is room for the gasses to expand and exit to the atmosphere under the hood. When a battery is in the trunk it's sealed up and the gasses aren't able to escape. I guess the pressure build up isn't good.

Like I said this is all what homeboy told me, take it with a grain of salt especially in light of the fact that I have had a battery in the trunk of my E36 with a vent tube just dangling around not hooked anywhere and no nuclear explosions have occurred.
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Old 07-29-2006, 02:11 PM   #36
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A non-sealed battery like the ones in our car generate hydrogen gas whenever they are recharged, which is pretty much whenever the car is running.

If you don't vent the hydrogen gas from the trunk, and you get a spark from any of the electrical doodads back there, it is theoretically possible for your car to do a good imitation of the zeppelin Hindenburg, circa 1937 at Lakehurst, NJ.
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Old 07-29-2006, 02:35 PM   #37
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Quote:
Originally Posted by slow323ci
A non-sealed battery like the ones in our car generate hydrogen gas whenever they are recharged, which is pretty much whenever the car is running.

If you don't vent the hydrogen gas from the trunk, and you get a spark from any of the electrical doodads back there, it is theoretically possible for your car to do a good imitation of the zeppelin Hindenburg, circa 1937 at Lakehurst, NJ.
hmm very interesting, I just wantd to also say that I have modified the "flaps" in the trunk...they kinda resemble gills (often they are the culprits for vibrations from bass)...basically i cut them all out so now there are just holes on either side of my trunk that go into the bumper....i doubt i'll have any issues with build up but I would rather do it than now....thanks everyone
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Old 07-31-2006, 12:54 PM   #38
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So I have 2 questions.

1.) About how long should I expect the original battery last me?

2.) What size of Optima Battery should fit? I have one in my other car and I like them.
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Old 07-31-2006, 03:31 PM   #39
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Originally Posted by louiegz
So I have 2 questions.

1.) About how long should I expect the original battery last me?

2.) What size of Optima Battery should fit? I have one in my other car and I like them.
Original battery? depends. Mine started having problems a little over a year since I bought the car new.
If our cars sit for an extended period of time, the car's electronics will drain a battery. When a battery gets completely depleted, it reduces it's life span. At the dealer, I always see cars at the showroom/parking lot with drained batteries that need to be charged, so if your car has been a the dealer for a while before being sold, the battery will most likely not last very long.

The battery compartment is pretty large, so I would think that any Optima should fit. Open it up and take some quick measurements, then check optima's website. I recently bough an optima for the wife's minivan at Pep Boys (they also sell them at Costco). If you have a big sound system, you might also want to look at a Stinger 1700. I have one in my car and it is the beast battery I have ever owned (better than Optima, but costs more).
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Old 02-04-2007, 08:36 PM   #40
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this is great info
thanks guys

now only question...
the phillips screwdriver needed to unscrew the mounting screw... is the one in the BMW toolkit in the trunk long enough?
or do i need a longer one?
is there any tool i need that's not provided for me in the car?
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