[rooks335]

Originally Posted by EB89

http://www.ehow.com/how_8681870_conv...amp-hours.html

Using this I get 54.1 AH which seems very low, mine is 80AH

haha formula seems off mark then.
unfortunately no Ah ratings on the new batt.

Would dividing by 2 then adding 16 be close to your 80AH ?
What RC rating is it?

Edit: Doh perhaps next time i'll just google it off against the battery model.

http://www.centurybatteries.com.au/r.../din65lh%20agm

70 Ah.

[DR-JEKL]

Originally Posted by rooks335

Just bought a battery a century heavy duty battery which is 'recommended' for the 335i.
http://www.centurybatteries.com.au/r...roduct/din65lh
CCA 660
RC 130

current battery I have is an NRMA battery type 3664
CCA 700
RC 120

There are a lot formulas out there to calculate the Ah of a battery. I Would like to ensure that I get as close as possible to the correct Ah when if I need to INPA the new value in.

RC\2 + 16 = Ah
or
RC\2 = Ah
or
RC*0.62 = Ah

Which works best?

Hmm shouldn't you have gotten the AGM!?!

http://www.centurybatteries.com.au/r.../din65lh%20agm

[tawfeeqh]

I replaced to a Varta batterry almost 2 years has been faultless ever since

[EB89]

Originally Posted by DR-JEKL

Hmm shouldn't you have gotten the AGM!?!

http://www.centurybatteries.com.au/r.../din65lh%20agm

Can change from AGM to normal apparently and its ok, just need to code the car and change the charging profile accordingly to the right battery type and AH

[rooks335]

AGM wasn't in stock and besides this is a 335ionabudget haha.

The century battery I got is old skool ! maintainable!
Planning to put some Innox magic battery fluids in it to extend the life out.

[Socket]

Varta FTW !!!

[DR-JEKL]

Originally Posted by rooks335

AGM wasn't in stock and besides this is a 335ionabudget haha.

The century battery I got is old skool ! maintainable!
Planning to put some Innox magic battery fluids in it to extend the life out.

ahh ok good luck with it.

that inox battery conditioner is good stuff, I use to always use that in my cars before most wet cell batteries became sealed!

[BM3Rrrr]

Sorry to resurrect an old thread but I'm in the market for a new battery
Here are the ones i've been looking at so far:

https://www.batteryworld.com.au/Vart...780CCA-Battery

https://www.batteryworld.com.au/Vart...760CCA-Battery

https://www.independentbatterydistri.../bosch-574.035

https://www.centurybatteries.com.au/.../din65lh%20agm

I believe the only difference between the two Varta batteries is one is AGM and the other isn't?
Seems as the consensus here is either Varta or Bosch?

[Ken Oath]

Are you replacing the original battery? 10 years would be acceptable life expectancy.
Have a look and see what specifications are marked on the battery as I would expect that it exceeds those you have linked.

A quick visual method is AGM is black top and flooded cell is white top. Replace with AGM if by chance the original has been replaced with a white top.

[BM3Rrrr]

Originally Posted by Ken Oath

Are you replacing the original battery? 10 years would be acceptable life expectancy.
Have a look and see what specifications are marked on the battery as I would expect that it exceeds those you have linked.

A quick visual method is AGM is black top and flooded cell is white top. Replace with AGM if by chance the original has been replaced with a white top.

Yes looking to replace the original as its 10yrs now.
I sometimes get a low battery notification on the iDrive, i have a CTEK MXS 5.0 (12V 5A) Battery Charger which i use to charge back up overnight.
I checked and its a black top Varta, the Varta AGM's are really expensive though. Was hoping to find something a bit more affordable

[rooks335]

Went with the Varta F18 from Autobarn. Was less then $400 if I remember correctly.
AGM would have been ideal but yeah no budget for a varta AGM.

F18's spec is 85ah 800cca
38 months warranty

[Ken Oath]

How much is considered expensive?
There are other OEM suppliers available in Australia if you don't select Varta.

[BM3Rrrr]

Originally Posted by Ken Oath

How much is considered expensive?
There are other OEM suppliers available in Australia if you don't select Varta.

$500 would be expensive which from what i can see the Varta AGM runs for.

Ultimately i would like an AGM as that is what is currently in the car. From the research i have done seems as though the consensus is around the community is get an AGM but im not 100% convinced that its really necessary. Does an AGM really provide more benefits then a non-AGM to justify spending? I've seen a few OEM type non AGM's that run between $2-300.

[Socket]

Originally Posted by BM3Rrrr

Sorry to resurrect an old thread but I'm in the market for a new battery
Here are the ones i've been looking at so far:

https://www.batteryworld.com.au/Vart...780CCA-Battery

https://www.batteryworld.com.au/Vart...760CCA-Battery

https://www.independentbatterydistri.../bosch-574.035

https://www.centurybatteries.com.au/.../din65lh%20agm

I believe the only difference between the two Varta batteries is one is AGM and the other isn't?
Seems as the consensus here is either Varta or Bosch?

Should get 5 years out of a battery
If you are still on the original battery you are doing very well but on borrowed time imo

The argument re standard vs AGM battery has been going on a while
Both do what they are designed to do, some from one point of view they are much of a muchness

From personal experience, I always used a high quality standard lead acid battery, professionally fitted and coded.
Was lucky to get a couple of years out of them and constantly getting low battery light, pop up on dash if running in aux for more then 10 mins

Have switched to a AGM on my last battery change, closing in on about 18 months and has been great and no issues with low battery lights running in aux

Def looking to swap the battery in the 320d to a AGM when it is next due

[BM3Rrrr]

Originally Posted by rooks335

Went with the Varta F18 from Autobarn. Was less then $400 if I remember correctly.
AGM would have been ideal but yeah no budget for a varta AGM.

F18's spec is 85ah 800cca
38 months warranty

I dont see Varta F18 listed on their website.
They do have the Varta E44 which i assume is the equivalent of the E39 AGM?

[BM3Rrrr]

Originally Posted by Socket

Should get 5 years out of a battery
If you are still on the original battery you are doing very well but on borrowed time imo

The argument re standard vs AGM battery has been going on a while
Both do what they are designed to do, some from one point of view they are much of a muchness

From personal experience, I always used a high quality standard lead acid battery, professionally fitted and coded.
Was lucky to get a couple of years out of them and constantly getting low battery light, pop up on dash if running in aux for more then 10 mins

Have switched to a AGM on my last battery change, closing in on about 18 months and has been great and no issues with low battery lights running in aux

Def looking to swap the battery in the 320d to a AGM when it is next due

Well i assume its the original as its marked "BMW" on the battery and not aftermarket unless the previous owner had it replaced by BMW which is likely.

[DR-JEKL]

FWIW i bought a Varta F21 AGM for $450 from battery world been good last 12 months..

My last bosch crapped out after 18 months, got it replaced under warranty and sold the replacement to get an AGM varta.

If you're not in a rush, autobarn stock Varta and occasionally have 30% off them.

[vtl]

Yeh I had 2 Bosch batteries which crapped out (I see this is an old thread and my previous post is in here)

Went with the Varta F21 80AH because it lines up with one of the available codable options. Did not want to fit a battery that was like 85AH since the nearest codable capacities only fall on 80 or 90ah.

I know in theory it should not make any difference since the battery ages and loses capacity over time anyway (and the IBS monitors battery capacity), but after 2 dead 74AH batteries just didn't want to deal with another failure

[BM3Rrrr]

The f21 fit no problems? Seems slightly larger in length (~37mm) compared to the e39 which is recommended when searching by vehicle on the Varta website.

[vtl]

On an E9x/E8x the tray has multiple bolting points to accomodate longer or shorter batteries. On an F30 theres only 1 bolting point so in that case the battery length matters but no such worries on e9x.

[insanesam]

My Varta e44 has come up to 3 years. Perfect timing that i'm now starting to have battery issues i.e date resetting, would get a battery symbol on the dash after sitting in the car for less than a minute with the radio on. Only obvious thing in Sydney is that its colder now.

Have charge numerous times with my ctek but after a few days same symptoms. Granted i'm not driving car as much due to COVID-19.
Anyways would anyone by any chance know whether the supercharge gold MF88HSS would fit?

[jard]

What would be the suggested next battery down out of curiosity from a Varta F21 AGM? I suspect the Varta F18 like Rooks335 mentioned earlier?