BMW X5
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Post Reply
 
Thread Tools Search this Thread
      01-10-2024, 02:57 PM   #1
JA-06
Enlisted Member
JA-06's Avatar
United_States
21
Rep
36
Posts

Drives: 2021 X5 40i
Join Date: Mar 2023
Location: US

iTrader: (0)

2021 40i Battery life

BIMMERPOST
     Featured on BIMMERPOST.com
Hi folks,

After 8 month overseas it was time for me to get back and try to restart my 2021 40i. While I had little hope it would start on its own I didn’t think it wouldn’t even let me in. Had to use the physical key to get in and then surprise nothing… idrive wouldn’t even start
Tried to jumpstart it with a NOCO booster, didn’t work

After contacting roadside assistance and had a truck try to jump start it (he tried with two batteries), it turns out the battery is just completely dead and needs replacement.
Considering both our F48 and F11 never had any issue restarting sometimes even after a year without driving is the battery life on the G05 this low?

I don’t know much about micro hybridation but I thought 48V might increase the battery life?
I recently just changed my F11 original battery who was 12 yo…
Appreciate 0
      01-10-2024, 03:13 PM   #2
wyatth
Colonel
3544
Rep
2,822
Posts

Drives: E90 ZCP
Join Date: Dec 2007
Location: Bay Area

iTrader: (0)

8mo connected without a tender? I'm surprised any standard car battery could survive that.
Either way, car batteries are good for 5-10yr depending on use and climate. You're a bit early, but use case doesn't seem kind to them either. I'd just replace.
Appreciate 0
      01-10-2024, 03:25 PM   #3
JA-06
Enlisted Member
JA-06's Avatar
United_States
21
Rep
36
Posts

Drives: 2021 X5 40i
Join Date: Mar 2023
Location: US

iTrader: (0)

Quote:
Originally Posted by wyatth View Post
8mo connected without a tender? I'm surprised any standard car battery could survive that.
Either way, car batteries are good for 5-10yr depending on use and climate. You're a bit early, but use case doesn't seem kind to them either. I'd just replace.
For some weird reason the 48V needs to have the hood wide open to accept the charge from a tender. I don’t think leaving it this way 8 month would have been a great idea either…

It’ll probably be replaced, still waiting for the dealership to reach out
Appreciate 0
      01-10-2024, 03:45 PM   #4
Marty in NY
Brigadier General
Marty in NY's Avatar
United_States
2628
Rep
4,258
Posts

Drives: 21 X5 40i, 18 GTi, Snowblower
Join Date: Nov 2014
Location: NY

iTrader: (0)

Quote:
Originally Posted by JA-06 View Post
For some weird reason the 48V needs to have the hood wide open to accept the charge from a tender. I don’t think leaving it this way 8 month would have been a great idea either…

It’ll probably be replaced, still waiting for the dealership to reach out
When the hood is open, it disconnects the 48v battery from the charging circuit, which is why you open it if you want to put a charger on your 12v battery.

.
Attached Images
 
Appreciate 0
      01-10-2024, 04:44 PM   #5
jad03060
Major General
United_States
3127
Rep
6,728
Posts

Drives: X5 45e
Join Date: Aug 2018
Location: NH

iTrader: (0)

One of the SIBs indicated that the 48vdc battery won't be charged unless the applied voltage/current exceeds 20A, which is over what most battery tenders can product (most are in the 4-10A range).
Appreciate 0
      01-10-2024, 04:52 PM   #6
TurtleBoy
General
TurtleBoy's Avatar
12882
Rep
19,392
Posts

Drives: 2019 X5 40i,2021 M340i
Join Date: Jan 2019
Location: Colorado

iTrader: (0)

Quote:
Originally Posted by Marty in NY View Post
When the hood is open, it disconnects the 48v battery from the charging circuit, which is why you open it if you want to put a charger on your 12v battery.

.
It doesn't remove it from the charging circuit but rather deactivates it from being able to supply power. As mentioned above, if the charger is powerful enough the 48v will be charged with the hood open.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2023.67
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50
Appreciate 0
      01-10-2024, 06:49 PM   #7
Marty in NY
Brigadier General
Marty in NY's Avatar
United_States
2628
Rep
4,258
Posts

Drives: 21 X5 40i, 18 GTi, Snowblower
Join Date: Nov 2014
Location: NY

iTrader: (0)

Quote:
Originally Posted by jad03060 View Post
One of the SIBs indicated that the 48vdc battery won't be charged unless the applied voltage/current exceeds 20A, which is over what most battery tenders can product (most are in the 4-10A range).
I believe its this SIB that you were referring to: SIB 61 01 21 MC-10202468-9999 48v Battery Maint.pdf


Quote:
Originally Posted by TurtleBoy View Post
It doesn't remove it from the charging circuit but rather deactivates it from being able to supply power. As mentioned above, if the charger is powerful enough the 48v will be charged with the hood open.
Thanks TB, my head was wrapped around the battery disconnection I did while performing work a while back. The attached SIB, in part, says.. ..

a) The 48 V battery does NOT charge when using a 12 V battery charger with the hood closed.
When charging the vehicle using a 12 V battery charger, the 48 V battery is ONLY able to charge with the hood open.

b) Trickle chargers and solar chargers may not be able to properly maintain the 48V battery to jad03060s point

c) Prolonged used of the “Emergency charging function” causes the 48 V battery to become totally discharged. This occurs when the 12 V battery is not properly maintained and the SOC of the 12 V battery
drops below the critical threshold value while the vehicle is in sleep mode. The vehicle is woken up and recharged from the 48 V battery. If the 12 V battery is not properly maintained, this cycle repeats until both batteries become totally discharged.

JA-06, I stand corrected and the important point is even with the hood open, the battery charger needs to be able to supply at least a 20a in order to start charging the 48V battery (which are quite pricy by the way)
Appreciate 0
      01-10-2024, 06:59 PM   #8
TurtleBoy
General
TurtleBoy's Avatar
12882
Rep
19,392
Posts

Drives: 2019 X5 40i,2021 M340i
Join Date: Jan 2019
Location: Colorado

iTrader: (0)

Quote:
Originally Posted by Marty in NY View Post
JA-06, I stand corrected
No need to stand, we are informal here.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2023.67
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50
Appreciate 0
      01-10-2024, 07:38 PM   #9
JA-06
Enlisted Member
JA-06's Avatar
United_States
21
Rep
36
Posts

Drives: 2021 X5 40i
Join Date: Mar 2023
Location: US

iTrader: (0)

Quote:
Originally Posted by TurtleBoy View Post
It doesn't remove it from the charging circuit but rather deactivates it from being able to supply power. As mentioned above, if the charger is powerful enough the 48v will be charged with the hood open.
If I’m not mistaken it’s mainly the 12V battery that is in charge of starting the car however I’ve seen on another thread people complaining how big of a pain it was to use a charger as for some people the car needs to remain open to accept charge, others can’t get charge if the hood is down (not closed)

I’ll know more tomorrow about what is actually going on but dealer said it wasn’t just a dead battery, they can read the key but it gives them no information at all about the car not even mileage so something else is messing up this car.
Guess I need to switch to a 50e😏 so I just have to plug it while gone
Appreciate 0
      01-10-2024, 07:51 PM   #10
TurtleBoy
General
TurtleBoy's Avatar
12882
Rep
19,392
Posts

Drives: 2019 X5 40i,2021 M340i
Join Date: Jan 2019
Location: Colorado

iTrader: (0)

Quote:
Originally Posted by JA-06 View Post
If I’m not mistaken it’s mainly the 12V battery that is in charge of starting the car however I’ve seen on another thread people complaining how big of a pain it was to use a charger as for some people the car needs to remain open to accept charge, others can’t get charge if the hood is down (not closed)
The 12v is used for cold starts and the 48v motor for others.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2023.67
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50
Appreciate 0
      01-11-2024, 07:45 AM   #11
Marty in NY
Brigadier General
Marty in NY's Avatar
United_States
2628
Rep
4,258
Posts

Drives: 21 X5 40i, 18 GTi, Snowblower
Join Date: Nov 2014
Location: NY

iTrader: (0)

Quote:
Originally Posted by TurtleBoy View Post
No need to stand, we are informal here.
Thanks much TB, I've been standing for sooo long its become hard to see through the cobwebs.
Attached Images
 
Appreciate 1
TurtleBoy12882.00
      01-11-2024, 03:09 PM   #12
JA-06
Enlisted Member
JA-06's Avatar
United_States
21
Rep
36
Posts

Drives: 2021 X5 40i
Join Date: Mar 2023
Location: US

iTrader: (0)

Dealer called me back he is trying to replace the battery but said they are on back order and should only arrive in a month or 2 (said he ordered them in August). His solution is to install an aftermarket somewhat similar battery… gonna have to accept since I’m not really ready to live without a car this long but damn how can BMW make so few batteries?
Appreciate 0
      01-11-2024, 03:14 PM   #13
jad03060
Major General
United_States
3127
Rep
6,728
Posts

Drives: X5 45e
Join Date: Aug 2018
Location: NH

iTrader: (0)

BMW doesn't generally make batteries...everyone is subject to supply chain issues.
Appreciate 0
      01-11-2024, 04:01 PM   #14
MattAu
Private
20
Rep
69
Posts

Drives: BMW X5 xDrive40i (MY2021)
Join Date: Jan 2024
Location: Canada

iTrader: (0)

So, from what I gather here, is there any reason why we want to keep the hood opened when we are using a battery maintainer like the CTEK or Noco that are charging at 4.3A? Even if you were to keep the hood opened, the 48v won't be charged as the charger is below 20A. Right?
Appreciate 0
      01-11-2024, 04:08 PM   #15
JA-06
Enlisted Member
JA-06's Avatar
United_States
21
Rep
36
Posts

Drives: 2021 X5 40i
Join Date: Mar 2023
Location: US

iTrader: (0)

Quote:
Originally Posted by MattAu View Post
So, from what I gather here, is there any reason why we want to keep the hood opened when we are using a battery maintainer like the CTEK or Noco that are charging at 4.3A? Even if you were to keep the hood opened, the 48v won't be charged as the charger is below 20A. Right?
People here will know better than me but I read that sometimes the car will not accept charge if hood is closed even if you can technically only charge the 12V
Appreciate 0
      01-11-2024, 04:11 PM   #16
TurtleBoy
General
TurtleBoy's Avatar
12882
Rep
19,392
Posts

Drives: 2019 X5 40i,2021 M340i
Join Date: Jan 2019
Location: Colorado

iTrader: (0)

Quote:
Originally Posted by MattAu View Post
So, from what I gather here, is there any reason why we want to keep the hood opened when we are using a battery maintainer like the CTEK or Noco that are charging at 4.3A? Even if you were to keep the hood opened, the 48v won't be charged as the charger is below 20A. Right?
Yes, with the mild-hybrid you should keep the hood open or else you risk the chance of draining/damaging the 48v battery.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2023.67
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50
Appreciate 0
      01-11-2024, 04:35 PM   #17
X6ix GTA
Second Lieutenant
Canada
138
Rep
250
Posts

Drives: 2022 X6 40i
Join Date: May 2022
Location: Toronto, Canada

iTrader: (0)

Garage List
  [0.00]
Quote:
Originally Posted by TurtleBoy View Post
Yes, with the mild-hybrid you should keep the hood open or else you risk the chance of draining/damaging the 48v battery.
Do we leave it wide open or would leaving it down in unlocked/unclicked position suffice?
Appreciate 0
      01-11-2024, 05:09 PM   #18
TurtleBoy
General
TurtleBoy's Avatar
12882
Rep
19,392
Posts

Drives: 2019 X5 40i,2021 M340i
Join Date: Jan 2019
Location: Colorado

iTrader: (0)

Quote:
Originally Posted by X6ix GTA View Post
Do we leave it wide open or would leaving it down in unlocked/unclicked position suffice?
I can't find the source now but as long as it is unlatched/unlocked it should be fine.
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2023.67
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50
Appreciate 1
X6ix GTA137.50
      01-11-2024, 05:22 PM   #19
GerryC
Captain
GerryC's Avatar
1528
Rep
816
Posts

Drives: BMW Z4 M40i, BMW X5x40i
Join Date: Jul 2021
Location: Florida

iTrader: (0)

Garage List
Quote:
Originally Posted by TurtleBoy View Post
I can't find the source now but as long as it is unlatched/unlocked it should be fine.
Easiest way to verify is the status message at the bottom of the instrument cluster. If it says Hood Open, you're good.

My practice since I don't want to forget the charger is connected is to place a pool noodle on top of the radiator cover and lower the hood on that. Hood can't latch and it provides a big visual reminder.
__________________
2023 Z4 ///M40i Thundernight Metallic/Cognac Vernasca/Moonlight/Shadowline/19" Black 799M/PP/DAP/ACC/HK
2022 X5 xDrive40i Phytonic Blue/Cognac Vernasca/DAPP/LSP/PP/CCP/PAP/20" Style 738/Spare Tire/Trailer Hitch
Appreciate 4
TurtleBoy12882.00
wyatth3544.00
X6ix GTA137.50
CGG158.00
      01-12-2024, 11:00 AM   #20
MattAu
Private
20
Rep
69
Posts

Drives: BMW X5 xDrive40i (MY2021)
Join Date: Jan 2024
Location: Canada

iTrader: (0)

So how do we maintain the 48v battery and keep it charged?

Quote:
Originally Posted by TurtleBoy View Post
Yes, with the mild-hybrid you should keep the hood open or else you risk the chance of draining/damaging the 48v battery.
Got it! So there is no way for us to charge the 48v battery like we can with the 12v?

And from other threads, driving it on the highway also doesn't necessarily charge the 48v either? Only stop and go driving will charge it? What's best way to maintain the 48v battery then?

And then there is the 3rd battery - the other 12v battery? How do we keep that charged?

So confused... (coming from a 2013 GX460 that only has ONE 12v battery LOL)

Last edited by MattAu; 01-12-2024 at 11:13 AM..
Appreciate 0
      01-12-2024, 11:26 AM   #21
TurtleBoy
General
TurtleBoy's Avatar
12882
Rep
19,392
Posts

Drives: 2019 X5 40i,2021 M340i
Join Date: Jan 2019
Location: Colorado

iTrader: (0)

Quote:
Originally Posted by MattAu View Post
Got it! So there is no way for us to charge the 48v battery like we can with the 12v?

And from other threads, driving it on the highway also doesn't necessarily charge the 48v either? Only stop and go driving will charge it? What's best way to maintain the 48v battery then?

And then there is the 3rd battery - the other 12v battery? How do we keep that charged?

So confused... (coming from a 2013 GX460 that only has ONE 12v battery LOL)
If you had a charger that put out greater than 20amps that would charge it. There really is no best way to maintain it or any need to do anything to maintain it. If you drive the vehicle all should be fine. If not, then just put the 12v on a charger once and awhile and that should do it.

What third battery are you referring to?
__________________
2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2023.67
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50
Appreciate 0
      01-12-2024, 11:43 AM   #22
MattAu
Private
20
Rep
69
Posts

Drives: BMW X5 xDrive40i (MY2021)
Join Date: Jan 2024
Location: Canada

iTrader: (0)

Quote:
Originally Posted by TurtleBoy View Post
If you had a charger that put out greater than 20amps that would charge it. There really is no best way to maintain it or any need to do anything to maintain it. If you drive the vehicle all should be fine. If not, then just put the 12v on a charger once and awhile and that should do it.

What third battery are you referring to?
I am going back to find the post(s) where I thought I read there are three batteries.

I picked up the car last week and has been playing with it and a couple of days ago, I got a warning on my MyBMW app that says Starter Battery is severely drained! I now got myself a CTEK MXS 5.0 only to read that some of us have AGM but some has Li-ion ones. Unlike the BMW branded CTEK charger, the CTEK branded charger doesn't have a choice for Li-ion. Should I return it?
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 03:25 PM.




xbimmers
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST