[dhayek]

Hello everyone, I have a 2020 M5 competition with 300 miles. It was stored for the last 9 months and now the battery is dead. It is 2 k to replace, and I live in greece and need two week to receive it from dealer as they don't have it in stock. 2 questions:
- will it make any problem if I use a normal agim battery for two weeks by the time I receive the lithium one? Positive and negative cables are ok but the is a third small cable that goes to the lithium that will be unused on the normal agim battery
- I tried to contact bmw to see if they would replace it on warranty, they said they have to diagnose but if the car have low miles and is unused they won't replace it. I find this unfair.
I tried to take the battery to a shop with a lithium charger and we tried to charge it without success.
Any thought is appreciated

[alhusam]

What is the voltage across battery terminals?

[carholic]

I didn’t even know lithium battery was standard or even an option on the M5. Do all F90 M5 come with a lithium battery?

[Aronis]

BMW of South Atlanta has a great online catalog for buying BMW parts from BMW. My local BMW dealer does not know what the internet is I guess.

Anyway....the part number is 61-21-6-805-461 which is a 70 AH battery. They list it as not available.
Another part number listed is 61217604808 which is a 105 AH also not available.

I'd love to know the true battery required for this car.

Found the first part number on GetBMWparts.com for $366.00

The odd thing is they list this battery part number for almost all BMW's. So I am not sure which is correct?

My understanding from this forum is that the M5 battery was some larger battery? Who knows? So replacement may not be as expensive as they say?

Will be looking forward to hearing of your resolution and what the actual battery cost.

Mike

[Stück]

Every F90 M5 I have worked on has had the 70Ah/860CCA Li-ion battery, mine included.

61 21 7 857 288 is the current PN, with a list price of $1,893.47 at this time. It is manufactured in Japan.

[TimmyBHGM5]

All M5 came with Lithium battery, cost will be high when need to replace

[micvite]

Originally Posted by dhayek

Hello everyone, I have a 2020 M5 competition with 300 miles. It was stored for the last 9 months and now the battery is dead. It is 2 k to replace, and I live in greece and need two week to receive it from dealer as they don't have it in stock. 2 questions:
- will it make any problem if I use a normal agim battery for two weeks by the time I receive the lithium one? Positive and negative cables are ok but the is a third small cable that goes to the lithium that will be unused on the normal agim battery
- I tried to contact bmw to see if they would replace it on warranty, they said they have to diagnose but if the car have low miles and is unused they won't replace it. I find this unfair.
I tried to take the battery to a shop with a lithium charger and we tried to charge it without success.
Any thought is appreciated

It's not unfair at all... everyone knows batteries die if you don't use them, and you should have put it on a maintenance charger.... so it wouldn't be covered under warranty because it was negligence that caused it to fail...

[jsf721]

Batteries for some strange reason are in short supply. 3 weeks wild be quick. We buy Indistries batteries from Trojan and full river are both very back ordered.

[Aronis]

Our cultural decline (worldwide) all thanks to man tinkering with nature for the purpose of power.

Mike

[Maverik259]

can you not find an aftermarket solution? There's a bunch of "light weight" Li-ION options out there for cars. Not very versed in them, just know they exist.

[carholic]

Originally Posted by TimmyBHGM5

All M5 came with Lithium battery, cost will be high when need to replace

Good to know! Good job, BMW! Even Ferrari’s don’t usually have lithium standard on most models.

[carholic]

Originally Posted by Maverik259

can you not find an aftermarket solution? There's a bunch of "light weight" Li-ION options out there for cars. Not very versed in them, just know they exist.

Braille, anti-gravity to name two brands I have used before.

[Demon Barber]

Originally Posted by carholic

Good to know! Good job, BMW! Even Ferrari’s don’t usually have lithium standard on most models.

You don't have to use a lithium battery when it's time to replace. Feel free to buy an AGM with similar CCA and amp hours. Just won't last as long as lithium.

[jav1]

The original poster appears to be MIA but someone helped me recently so perhaps this can help someone else.

The lithium Ion battery has a built in BMS (Battery Management System) and safety relay that physically disconnects the cells from the terminals to protect itself when cell voltage gets too low. If the terminal voltage is 0, then the relay is likely "open". Someone asked what the terminal voltage was and I didn't see an answer. That was a VERY important question! If the voltage is 0- then a battery charger will NOT work because the battery terminals are "physically" disconnected from the cells that need recharging.

I have been able to open up a battery and charge the cells "directly" with a Lithium Ion specific charger and then reset the relay. There's a Youtube video about this- search "BMW Lithium Ion Battery Disassembly"- you will find one from "M. Ovidiu"... that's the one to watch.

I highly doubt the battery is truly "dead" - however- opening up the battery, while relatively easy, carries some risk and you should have some mechanical and electrical knowledge. Also- the car's ECU may still tell you the battery needs to be replaced even after the battery is brought back on line. I'm not that far yet but I'm hoping I can reset that message on mine.

IMHO- our cars draw some significant current in stand-by mode... I'd stick with a lithium Ion battery and I think the ECU will know if you don't, but, I don't know for sure.

Hope this helps.

[Alberta]

Originally Posted by bmwNmini

Hi, if anyone here is looking for a genuine BMW 61217857288 Rear Lithium Battery, I have a brand new one that I'm selling on Ebay for substantially less than retail. You can also message me and I'll sell it to you off-Ebay for less to avoid the fee if you are ok with that. Here is the link:

https://www.ebay.com/itm/186196795508

Jeez, you only posted 5 posts on this forum, all about your battery.

Get the hell outa here.