OEM AGM Battery

[Dominic22]

I need a new battery and was trying to find the AGM OEM one or a newer version of the OEM one if possible.

Does anyone know if this is the correct one to fit https://www.ebay.co.uk/itm/Car-Battery-Genuine-Bmw-AGM-VRLA-12V-80AH-800A/372991080192?hash=item56d8003700:g:tV0AAOSwi6BecMYR if not does anyone have any links to where available.

 

[ph001]

There is no technical reason why you have to fit an AGM on the M cars. I think it was only done from the factory to save weight.

 

[Argenta]

I fit a smaller 55Ah battery 2 years ago. Lighter and still works great!

 

[XMetal]

There is no technical reason why you have to fit an AGM on the M cars. I think it was only done from the factory to save weight.

Actually, there ARE technical reasons for an AGM. AGM can charge up to five times faster than the flooded version, and the ability to deep cycle. AGM offers a depth-of-discharge of 80 percent; the flooded, on the other hand, is specified only at 50 percent depth-of-discharge. So, the advantages are there if you don't drive your car very often. Weight saving was NOT the reason that was done from the factory since AGM actual weighs more than flooded lead acid version.

With that said, there's no reason for fitting and paying for a BMW AGM battery since BMW don't actually make any batteries themselves. Any major brands with similar specs should be suffice.

 

[Mr Tidy]

Actually, there ARE technical reasons for an AGM. AGM can charge up to five times faster than the flooded version, and the ability to deep cycle. AGM offers a depth-of-discharge of 80 percent; the flooded, on the other hand, is specified only at 50 percent depth-of-discharge. So, the advantages are there if you don't drive your car very often. Weight saving was NOT the reason that was done from the factory since AGM actual weighs more than flooded lead acid version.

With that said, there's no reason for fitting and paying for a BMW AGM battery since BMW don't actually make any batteries themselves. Any major brands with similar specs should be suffice.

Thanks for that, useful information to have for "one day" as my M doesn't get driven that often - and just now hardly at all sadly.

Presumably on a car of this age the AGM ones don't need coding?

 

[Dominic22]

Thanks, any idea if the one in the link is ok to fit? It did not seem a bad price compared to other AGM ones and if I look at Eurocarparts etc

 

[Argenta]

No coding etc. This is before the e90-e87 etc era.
Its all basically e46, but styling one generation later. Best of both worlds!

 

[ph001]

There is no technical reason why you have to fit an AGM on the M cars. I think it was only done from the factory to save weight.

Actually, there ARE technical reasons for an AGM. AGM can charge up to five times faster than the flooded version, and the ability to deep cycle. AGM offers a depth-of-discharge of 80 percent; the flooded, on the other hand, is specified only at 50 percent depth-of-discharge. So, the advantages are there if you don't drive your car very often. Weight saving was NOT the reason that was done from the factory since AGM actual weighs more than flooded lead acid version.

With that said, there's no reason for fitting and paying for a BMW AGM battery since BMW don't actually make any batteries themselves. Any major brands with similar specs should be suffice.

You have totally misunderstood my post. There is no technical reason you HAVE to fit an agm battery to an M. You certainly may CHOOSE to fit one due to the performance benefits. But that goes for any other car out there that doesn’t use start / stop or efficient dynamics.

As for your comment re weight. I suspect I can find far more references on the web that state AGM is lighter than conventional lead acid than vice-versa, but directly comparable data seems hard to come by.

 

[XMetal]

There is no technical reason why you have to fit an AGM on the M cars. I think it was only done from the factory to save weight.

Actually, there ARE technical reasons for an AGM. AGM can charge up to five times faster than the flooded version, and the ability to deep cycle. AGM offers a depth-of-discharge of 80 percent; the flooded, on the other hand, is specified only at 50 percent depth-of-discharge. So, the advantages are there if you don't drive your car very often. Weight saving was NOT the reason that was done from the factory since AGM actual weighs more than flooded lead acid version.

With that said, there's no reason for fitting and paying for a BMW AGM battery since BMW don't actually make any batteries themselves. Any major brands with similar specs should be suffice.

You have totally misunderstood my post. There is no technical reason you HAVE to fit an agm battery to an M. You certainly may CHOOSE to fit one due to the performance benefits. But that goes for any other car out there that doesn’t use start / stop or efficient dynamics.

As for your comment re weight. I suspect I can find far more references on the web that state AGM is lighter than conventional lead acid than vice-versa, but directly comparable data seems hard to come by.

Here's an H6 flooded lead acid weighing 39 lbs
https://www.autozone.com/batteries-starting-and-charging/battery/duralast-gold-battery-h6-dlg-group-size-48-730-cca/832332_1193489_25698

Here's the same branded H6 AGM version weighing 47 lbs
https://www.autozone.com/ignition-tune-up-and-routine-maintenance/battery/duralast-platinum-battery-h6-agm-group-size-48-760-cca/319460_546725_25697

 

[mr.tourette]

type 96 batteries are around 2~3Kg heavier for agm according to this seller https://advancedbatterysupplies.co.uk/brand/vehicles/bmw-car-batteries/z-series/z4-cabriolet-models-2003-present/

 

[Adam D]

Keep an eye on eurocarparts for when the AGM Bosch s5 can be had on a discount code. Fits perfect.

 

[Jembo]

Keep an eye on eurocarparts for when the AGM Bosch s5 can be had on a discount code. Fits perfect.

I would be very wary of buying an AGM battery at Eurcarparts prices
- this one from ECP https://www.eurocarparts.com/car-battery?Brands=Varta_AGM ... £350 odd...
- a simple google search shows more palatable prices IMO for the same battery...whether it's Bosch or Varta etc.. https://www.google.com/search?q=varta+agm+096&rlz=1C1GCEA_enFR824FR824&oq=varta+agm+096&aqs=chrome..69i57j69i59j0.4208j1j7&sourceid=chrome&ie=UTF-8


You need to check the specs... but it's not rocket science to save quite a few quid

 

[ph001]

It is strange that the M comes with an AGM battery from the factory but uses a standard alternator and no battery management system to control the charge. There are many references around the web in response to people asking if they can fit an AGM battery to a normal car that was never specified with one originally, and lots of people saying the AGM can easily be overcharged on long journeys with a standard alternator.

Also strange in a way that the E46 M3 which shares the same engine / alternator was never specified with AGM???

 

[Argenta]

I didn't have a AGM in mine.

 

[pvr]

No Z4M was delivered with an AGM battery

 

[Dominic22]

I replaced it with this one is the end. https://www.ebay.co.uk/itm/BOSCH-570901076-S5A08-611925-096-70Ah-760-CCA-Car-Battery/124101524420?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

 

[ph001]

No Z4M was delivered with an AGM battery

Some definitely were.

 

[z4mcoupe]

This might be slightly off the original topic, but battery related I think..

I have a normal BOSCH battery (S5?) (non AGM) which I connect to my C-TEK charger when not driving. When i go to restart the car, it takes a few turns of the engine before the car fires up again (5-7 seconds). Once it's going, it'll turn over on the first crank but when it's laid up for even a few days the first start does take awhile longer. Is that normal for those who aren't using their cars as daily drviers? I thought with the C-TEK trickle charge it should keep it ready to go? I have done a recon on the battery and it's made no difference. The battery is about 4 yrs old but showing as green/good on the indicator in the battery.

My other car which also isn't a daily driver starts first crank with no problems even after weeks on end sitting idle... And that car isn't connected to a trickle charger, but it is a 'new' car.

 

[Argyll Andy]

This might be slightly off the original topic, but battery related I think..

I have a normal BOSCH battery (S5?) (non AGM) which I connect to my C-TEK charger when not driving. When i go to restart the car, it takes a few turns of the engine before the car fires up again (5-7 seconds). Once it's going, it'll turn over on the first crank but when it's laid up for even a few days the first start does take awhile longer. Is that normal for those who aren't using their cars as daily drviers? I thought with the C-TEK trickle charge it should keep it ready to go? I have done a recon on the battery and it's made no difference. The battery is about 4 yrs old but showing as green/good on the indicator in the battery.

My other car which also isn't a daily driver starts first crank with no problems even after weeks on end sitting idle... And that car isn't connected to a trickle charger, but it is a 'new' car.

I’ve got an S5 008 too that’s been connected to a Ctek MXS 5.0 it’s not been driven in almost a month other than in and out the drive to rotate cars on the charger. It was connected to the charger for 5 days including a recon. It starts 1st time instantly and hasn’t been on charge for about a week now and started 1st time tonight.

 

[mmm-five]

This might be slightly off the original topic, but battery related I think..

I have a normal BOSCH battery (S5?) (non AGM) which I connect to my C-TEK charger when not driving. When i go to restart the car, it takes a few turns of the engine before the car fires up again (5-7 seconds). Once it's going, it'll turn over on the first crank but when it's laid up for even a few days the first start does take awhile longer. Is that normal for those who aren't using their cars as daily drviers? I thought with the C-TEK trickle charge it should keep it ready to go? I have done a recon on the battery and it's made no difference. The battery is about 4 yrs old but showing as green/good on the indicator in the battery.

My other car which also isn't a daily driver starts first crank with no problems even after weeks on end sitting idle... And that car isn't connected to a trickle charger, but it is a 'new' car.

It's because the Z4's battery is in the boot, so the electrons drain back into the battery when it's been sat a while, so it takes a few cranks for the electrons to make it all the way to the front of the car and the ignition system.

Fuel will also have done similar.