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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions Battery tender/charger for 2021 M340i with 48 volt system

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      11-29-2020, 07:58 AM   #1
covinsky
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Battery tender/charger for 2021 M340i with 48 volt system

This 2021 M340i will be stored 4 months out of the year. I cannot seem to get an accurate answer from anyone at BMW as to which battery tender/charger will work properly with BMW's new 48 volt system. I have spoken with 4 different sources and they all simply direct me to BMW accessories and the two chargers they offer do not specify 48 volts. Thanks in advance for any information!
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      11-29-2020, 08:14 AM   #2
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The car still has a 12v battery for car eletronics, the 48v battery is for the mild-hybrid system and I don't think you have a way of charging it directly
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      12-02-2020, 09:26 AM   #3
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Spoke with Deltran who makes Battery Tender and they suggested their 4 volt unit. It is the same unit they built for BMW accessories. Hope this helps anyone else for their 2021 BMW. Chris
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      12-02-2020, 02:38 PM   #4
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I have a mild hybrid engine and tried to trickle charge the battery with Ctek Mxs 5.0 without success, after a couple of hours the charger gets very hot and an error message about power management shows up on the central screen. Still figuring out if it's a problem of IBS sensor or just mild Hybrid engines needs different chargers...
covinsky I think you mean 4 amp, right?
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      12-02-2020, 03:56 PM   #5
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Quote:
Originally Posted by gianlucatest View Post
I have a mild hybrid engine and tried to trickle charge the battery with Ctek Mxs 5.0 without success, after a couple of hours the charger gets very hot and an error message about power management shows up on the central screen. Still figuring out if it's a problem of IBS sensor or just mild Hybrid engines needs different chargers...
covinsky I think you mean 4 amp, right?
What are you physically connecting the ctek to?

No issue with my mxs5.0 in AGM mode.
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      12-02-2020, 04:09 PM   #6
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Quote:
Originally Posted by Amos91 View Post
What are you physically connecting the ctek to?

No issue with my mxs5.0 in AGM mode.
To the connectors in the engine bay....
Thank you, at least I understood that the problem is mine
Now I have to convince the dealer about that
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      12-02-2020, 04:11 PM   #7
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Quote:
Originally Posted by gianlucatest View Post
To the connectors in the engine bay....
Thank you, at least I understood that the problem is mine
Now I have to convince the dealer about that
Just checking you weren't hooking up directly to the battery. Mine is only a 320d so no hybrid system but it should charge the normal battery fine.

I've used it through lockdown to keep it topped up.
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      12-03-2020, 05:13 AM   #8
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Do the mild hybrids even have an AGM battery?
I thought they had switched to Li-Ion. In that case you should only charge with a charger that can properly handle them.
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      12-03-2020, 09:34 AM   #9
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I am going in today

To speak with a BMW genius at a local dealership. I will see if we can find a service manager who can give us an answer to this question.
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      12-04-2020, 03:01 PM   #10
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Yes, 4 amp. I will follow this to see what dealer/genius says.
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      12-08-2020, 07:57 PM   #11
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Quote:
Originally Posted by ovesund View Post
Do the mild hybrids even have an AGM battery?
I thought they had switched to Li-Ion. In that case you should only charge with a charger that can properly handle them.
car with mild hybrids still have AGM battery at the trunk, mild hybrids get an extra Li-Ion battery at the engine bay
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      12-15-2020, 11:22 AM   #12
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Quote:
Originally Posted by Mr. Li View Post
car with mild hybrids still have AGM battery at the trunk, mild hybrids get an extra Li-Ion battery at the engine bay
This is correct. I have confirmed it is an AGM battery and you can charge it or use a battery maintainance device in AGM mode just like you would with other cars, but I will say when I hook mine up every 10 minutes or so the car is making electronic sounds from under the hood. Not sure what that is about but no harm appears to be done. I haven't left it on for more than an hour...

Anyone know what the car is doing?
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      12-15-2020, 01:32 PM   #13
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Quote:
Originally Posted by MBM340 View Post
... but I will say when I hook mine up every 10 minutes or so the car is making electronic sounds from under the hood. Not sure what that is about but no harm appears to be done. I haven't left it on for more than an hour...

Anyone know what the car is doing?
Is your car unlocked? If so, probably making self checks, as it is not going into sleep mode. It may not be able to shut down the same way with the charger connected.

I often charge my car in the locked condition, when in sleep mode.
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      12-15-2020, 03:35 PM   #14
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Quote:
Originally Posted by MBM340 View Post
This is correct. I have confirmed it is an AGM battery and you can charge it or use a battery maintainance device in AGM mode just like you would with other cars, but I will say when I hook mine up every 10 minutes or so the car is making electronic sounds from under the hood. Not sure what that is about but no harm appears to be done. I haven't left it on for more than an hour...

Anyone know what the car is doing?
Exactly as mine. If you try to measure the voltage of the battery you can see that every time you hear those noises the charger drops the voltage and then start to slowly increase it until it reaches 13.10 volts, instead of being stable all the time.
In my case the charge is not efficient and I gain more or less 5% in 8 hours.
I tried both locked and unlocked and the result is the same.
Also, you can try to leave the charger overnight and see if an error message about power management shows up in the morning.
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      12-15-2020, 08:39 PM   #15
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Quote:
Originally Posted by gianlucatest View Post
Exactly as mine. If you try to measure the voltage of the battery you can see that every time you hear those noises the charger drops the voltage and then start to slowly increase it until it reaches 13.10 volts, instead of being stable all the time.
In my case the charge is not efficient and I gain more or less 5% in 8 hours.
I tried both locked and unlocked and the result is the same.
Also, you can try to leave the charger overnight and see if an error message about power management shows up in the morning.
When the holidays arrive I will give it a shot overnight and see what happens. I have a readout on my Schumacher charger, but not on the Griot's tender...
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      12-16-2020, 12:43 PM   #16
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Still following this. Battery Tender went into shut down mode because battery was not fully charged in 24 hours. Who will be the first to figure out this mystery? Tried Battery tender while the BMW was unlocked and also while locked. No luck so far.
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      01-04-2021, 05:53 PM   #17
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Encountered something like this with our G20 M340d xDrive which has this 48v system. Battery charging with the CTEK MXS 5.0 does work however the charger gets noticeably very very warm. It appears that the system doesn't go into a full "sleep state" whilst charging as the BlackVue dashcam battery I use strangely seemed to continue to receive charge well after it shouldn't whilst trickle charging, which doesn't happen when not on the charger. I also saw the "energy management" error appear every time after charging. I spoke to our BMW dealer who said they don't have any information to suggest that the normal trickle chargers shouldn't be used with these models so it is rather confusing. I also asked BMW UK for further assistance as I'm hoping they might be able to say why it occurs or what the specific advice is on charging models with this system.

Last edited by Renzm; 01-05-2021 at 12:03 PM..
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      01-04-2021, 06:10 PM   #18
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I would like to know too, but I don't think most folks at dealers know. I tried a battery tender whilst unlocked and the car made a number of sounds like it was trying to do something but God knows what. After it did that for 15 minutes I pulled off the tender.

Any BMW employees on here that can give us a technically correct answer?
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      01-04-2021, 06:45 PM   #19
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Quote:
Originally Posted by MBM340 View Post
I would like to know too, but I don't think most folks at dealers know. I tried a battery tender whilst unlocked and the car made a number of sounds like it was trying to do something but God knows what. After it did that for 15 minutes I pulled off the tender.

Any BMW employees on here that can give us a technically correct answer?
Please reach out to Flamingi he worked at BMW Munich perhaps he can shed some insight info.
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      01-07-2021, 07:51 AM   #20
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Quote:
Originally Posted by MBM340 View Post
I would like to know too, but I don't think most folks at dealers know. I tried a battery tender whilst unlocked and the car made a number of sounds like it was trying to do something but God knows what. After it did that for 15 minutes I pulled off the tender.

Any BMW employees on here that can give us a technically correct answer?
The same issues with my 2021 X5 40i. I have tried CTEK MXS 5.0, NOCO, but no one worked, got battery management message and heard sounds from engine compartment occasionally like the car was trying to reboot something. CTEK stayed at stage 3 and NOCO stayed at 50% after 36 hours charging. I tried both locked and unlocked and the result is the same.

Here's the thread on G05 forum.
https://g05.bimmerpost.com/forums/sh....php?t=1786709
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      01-07-2021, 12:42 PM   #21
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Originally Posted by tcbmhell View Post
The same issues with my 2021 X5 40i. I have tried CTEK MXS 5.0, NOCO, but no one worked, got battery management message and heard sounds from engine compartment occasionally like the car was trying to reboot something. CTEK stayed at stage 3 and NOCO stayed at 50% after 36 hours charging. I tried both locked and unlocked and the result is the same.

Here's the thread on G05 forum.
https://g05.bimmerpost.com/forums/sh....php?t=1786709
Was just going to ask if any other models seem to be affected - seems like pretty conclusively anything with the 48v system encounters the same. Our 530d LCI has the mild hybrid system also but it's a daily driver so doesn't necessarily need trickle charging. I saw in some of the comments on the post you linked that mention "only charging when the hood is open". I just checked the BMW Drivers Guide app here and it says "With mild hybrid technology: only charge the battery when the front flap is open." The wording "flap" was a bit of a strange one and I wasn't sure what they actually meant by that but from that post it must obviously mean the "hood" or "bonnet" itself in order to keep the 48v system off. I will have to try this but it seems strange that in any case the vehicle would have to be unlocked.
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      01-07-2021, 01:22 PM   #22
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Quote:
Originally Posted by Renzm View Post
Was just going to ask if any other models seem to be affected - seems like pretty conclusively anything with the 48v system encounters the same. Our 530d LCI has the mild hybrid system also but it's a daily driver so doesn't necessarily need trickle charging. I saw in some of the comments on the post you linked that mention "only charging when the hood is open". I just checked the BMW Drivers Guide app here and it says "With mild hybrid technology: only charge the battery when the front flap is open." The wording "flap" was a bit of a strange one and I wasn't sure what they actually meant by that but from that post it must obviously mean the "hood" or "bonnet" itself in order to keep the 48v system off. I will have to try this but it seems strange that in any case the vehicle would have to be unlocked.
This's what it says on G05 manual.
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