BMW OEM AGM Battery

IK6SPEED · 11-07-2019, 01:03 PM

From the various OEM AGM Battery sizes for the F3x series, it now seems that BMW has standardized the replacement as a 92AH Battery Part Number 61-21-2-353-812.

As 70, 80 and 90 AH batteries were all used originally, the battery has to be coded and registered in the vehicle’s electronics.

As 92AH is not a setting option, people just use the 90AH setting.

So, giving that sometimes these electronic systems are so touchy, what impact on charging would a 100AH Battery as the car is only looking for a 90AH Battery Max?

While on the subject, what brand car battery do you consider the best and most reliable for a BMW Replacement?

EvenKeel · 11-07-2019, 03:36 PM

Quote:

Originally Posted by IK6SPEED

From the various OEM AGM Battery sizes for the F3x series, it now seems that BMW has standardized the replacement as a 92AH Battery Part Number 61-21-2-353-812.

As 70, 80 and 90 AH batteries were all used originally, the battery has to be coded and registered in the vehicle’s electronics.

As 92AH is not a setting option, people just use the 90AH setting.

So, giving that sometimes these electronic systems are so touchy, what impact on charging would a 100AH Battery as the car is only looking for a 90AH Battery Max?

While on the subject, what brand car battery do you consider the best and most reliable for a BMW Replacement?

Quote:

Originally Posted by IK6SPEED

From the various OEM AGM Battery sizes for the F3x series, it now seems that BMW has standardized the replacement as a 92AH Battery Part Number 61-21-2-353-812.

As 70, 80 and 90 AH batteries were all used originally, the battery has to be coded and registered in the vehicle's electronics.

As 92AH is not a setting option, people just use the 90AH setting.

So, giving that sometimes these electronic systems are so touchy, what impact on charging would a 100AH Battery as the car is only looking for a 90AH Battery Max?

While on the subject, what brand car battery do you consider the best and most reliable for a BMW Replacement?

Good timing. Have the exact same query.

upsidedownfunnel · 11-07-2019, 05:32 PM

Warning, I'm not trying to answer the question as I don't know:

I always assumed that the battery registration process and the requirement for battery capacity information was directly tied to the charging strategy with efficient dynamics. Our cars will use a rudimentary brake regen system and the car tries to keep a certain percentage of capacity free for that purpose. That may also be why knowing the age of the battery is important. So it can look at the voltage of the battery and calculate how much capacity it has. It's using the voltage, max capacity rating and age of the battery to estimate the current capacity level and adjusting the charging strategy accordingly. So I doubt there's any way to damage the car's electronics. At worst you might just kill the battery a little faster or use it inefficiently.

To answer your question, I've used Duralast Platinum batteries in past BMWs with great results. They also all interestingly seemed to be made in Germany.

Livetodrive · 11-07-2019, 08:40 PM

Staying on topic, what is the expected life of the original battery? Mine has a relatively easy life, given it is garaged? it’s a 2016.

obert · 11-07-2019, 09:14 PM

Quote:

Originally Posted by Livetodrive

Staying on topic, what is the expected life of the original battery? Mine has a relatively easy life, given it is garaged? it’s a 2016.

I think it is about 5 years but they can last longer.

adhrp · 11-07-2019, 09:26 PM

Quote:

Originally Posted by Livetodrive

Staying on topic, what is the expected life of the original battery? Mine has a relatively easy life, given it is garaged? it’s a 2016.

Mine completed 8 years this month and still going strong (although I may replace it very soon). Rough life. Never garaged, lived all its life in the north.

Gen13 F36 · 11-07-2019, 10:07 PM

You should get a minimum of 5 years and up to 10 years 😁

KDW4him · 11-23-2019, 07:15 PM

"As 92AH is not a setting option" in what app or software IK6SPEED ?

IK6SPEED · 11-23-2019, 08:01 PM

Quote:

Originally Posted by KDW4him

"As 92AH is not a setting option" in what app or software IK6SPEED ?

The BMW settings for which battery is in the car and registration of that battery.

Onizukachan · 11-28-2019, 02:03 AM

The AGM in my SULEV e46 was 14 years old when a failed alternator and a long limp home killed it. Dekah made good batteries.
Replaced with Bosch AGM. Of all the choices it seemed the best of the limited options.

00e46sedan · 11-28-2019, 01:50 PM

My battery has lasted,it's still the oem one since 2013 i tested the battery about 2 months ago and it was on 325 cca so its time for a new battery .

11-07-2019, 01:03 PM	#1
IK6SPEED Banned 4486 Rep 10,473 Posts Drives: BMW M3 / AH3 Join Date: Jan 2013 Location: Cali iTrader: (23)	BMW OEM AGM Battery From the various OEM AGM Battery sizes for the F3x series, it now seems that BMW has standardized the replacement as a 92AH Battery Part Number 61-21-2-353-812. As 70, 80 and 90 AH batteries were all used originally, the battery has to be coded and registered in the vehicle’s electronics. As 92AH is not a setting option, people just use the 90AH setting. So, giving that sometimes these electronic systems are so touchy, what impact on charging would a 100AH Battery as the car is only looking for a 90AH Battery Max? While on the subject, what brand car battery do you consider the best and most reliable for a BMW Replacement?
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11-07-2019, 05:32 PM	#3
upsidedownfunnel Colonel 1996 Rep 2,499 Posts Drives: 2014 335i Join Date: Jul 2017 Location: SoCal iTrader: (4) Garage List 2014 BMW 335i [0.00]	Warning, I'm not trying to answer the question as I don't know: I always assumed that the battery registration process and the requirement for battery capacity information was directly tied to the charging strategy with efficient dynamics. Our cars will use a rudimentary brake regen system and the car tries to keep a certain percentage of capacity free for that purpose. That may also be why knowing the age of the battery is important. So it can look at the voltage of the battery and calculate how much capacity it has. It's using the voltage, max capacity rating and age of the battery to estimate the current capacity level and adjusting the charging strategy accordingly. So I doubt there's any way to damage the car's electronics. At worst you might just kill the battery a little faster or use it inefficiently. To answer your question, I've used Duralast Platinum batteries in past BMWs with great results. They also all interestingly seemed to be made in Germany. Last edited by upsidedownfunnel; 11-07-2019 at 05:37 PM..
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11-07-2019, 08:40 PM	#4
Livetodrive Second Lieutenant 109 Rep 292 Posts Drives: 2016 340i X Drive Join Date: Dec 2015 Location: Pa. iTrader: (0) Garage List 2016 BMW 340i XDrive [0.00]	Staying on topic, what is the expected life of the original battery? Mine has a relatively easy life, given it is garaged? it’s a 2016.
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11-07-2019, 10:07 PM	#7
Gen13 F36 Brigadier General 1599 Rep 3,752 Posts Drives: 428i Gran Coupe Join Date: Nov 2017 Location: Los Angeles, CA iTrader: (1)	You should get a minimum of 5 years and up to 10 years 😁
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11-23-2019, 07:15 PM	#8
KDW4him Enlisted Member 0 Rep 40 Posts Drives: F30 335i xDrive Join Date: Aug 2019 Location: Alma, MI iTrader: (0)	"As 92AH is not a setting option" in what app or software IK6SPEED ? __________________ 2013 335i xDrive Melbourne Red my first BMW BMW, you might find better but you can't pay more
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11-28-2019, 02:03 AM	#10
Onizukachan Great Teacher 1076 Rep 1,303 Posts Drives: 06 e91 325ix Join Date: Aug 2015 Location: El Paso iTrader: (0) Garage List 2006 E91 325ix [10.00] 2006 Mini r53 JCW [0.00] 2005 Mini r53 [0.00]	The AGM in my SULEV e46 was 14 years old when a failed alternator and a long limp home killed it. Dekah made good batteries. Replaced with Bosch AGM. Of all the choices it seemed the best of the limited options.
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11-28-2019, 01:50 PM	#11
00e46sedan Captain 68 Rep 698 Posts Drives: 16’ F13 640i M Sport Join Date: Mar 2014 Location: Colton iTrader: (4)	My battery has lasted,it's still the oem one since 2013 i tested the battery about 2 months ago and it was on 325 cca so its time for a new battery .
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