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      01-04-2021, 02:42 AM   #67
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Quote:
Originally Posted by jad03060 View Post
Many of those battery tenders are 3-4A devices. If the battery was down to 25%, it could need nearly 600Ahr to fully charge it.
600 Ah? I don't think the batteries are that large. My F11 has a 105 Ah battery - I don't know about G05, but I would think they're about the same or smaller.
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      01-04-2021, 02:25 PM   #68
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Originally Posted by biterror View Post
600 Ah? I don't think the batteries are that large. My F11 has a 105 Ah battery - I don't know about G05, but I would think they're about the same or smaller.
I'm thinking cold cranking amps, and it could be higher...sorry...

But, that's still many hours if the charger is 3-4A, even at 105A.
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      01-04-2021, 02:49 PM   #69
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Originally Posted by jad03060 View Post
I'm thinking cold cranking amps, and it could be higher...sorry...

But, that's still many hours if the charger is 3-4A, even at 105A.
Yes, that's true.
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      01-04-2021, 05:10 PM   #70
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Originally Posted by ChiefOne View Post
The battery of my BMW X5 XDrive 40i (MY2021) is fully charged now, or at least that's what the charger indicator is showing. This is what worked for me/I learned from the whole process -

I attempted with the BMW charger a few times, that did not seem to work. I then bought a CTEK MXS5.0, which did not seem to work in the first attempt. I tried again with the same CTEK charger, and it went to stage 7.

What I did differently that seemed to work -
I connected the CTEK MXS5.0 charger to the terminals under the hood, lowered the hood gently, did not close all the way, did not lock the car. I let the charger do its job without monitoring how many hours it's sitting on stage 3, or without frequently checking if the console had a Battery Management message. I did check once or twice though by opening the vehicle door, and that would activate the console and I would see the battery management message. I ignored the message and let the charger run its cycles.

It took well over 26 hours for the charger status to get to stage 7 and stay static on that stage.

That evening, I unplugged the charger and took my vehicle for a spin for about 100 miles, came back and hooked the BMW charger this time, and let it sit. It stayed on stage 3 for a couple of hours and then in about 4 hours it got to Stage 7 and stayed static at that stage.

This proved to me that the BMW charger is working fine, and would have done the job in the first place if I would have let it connected for whatever time it would have taken.


My Lessons learned -
Once the charger is connected, it needs to be left alone to do its job. The control message on Battery Management, at least in my case, only appeared if I woke up the system by opening the door, the message to me just meant that the system is not completely inactive even if it is attempting to do so. Depending upon what state the battery is in, it will take whatever time required to come up to stage 7.

I am keeping the BMW charger and returning the CTEK one.
I have connected my new NOCO charger for 27hours, still at 25% stage. I unplug it, unlock the vehicle, plug the charger and keep the the vehicle unlock. Hood is always not closed. Just after 20mins, the charger move to 50% stage... It seems that if the vehicle is locked, on-board computer or a sensor will prevent the charger from charging...
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      01-04-2021, 06:26 PM   #71
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I wonder why the hood needs to stay open for the X5 with 48v mild hybrid system (as mentioned on the owners manual). Now it appears door needs to stay open too! Very interesting. [edit: doors doesn't need to stay unlocked, vehicle can be locked while being charged; however, hood/bonnet must stay open]

"With Mild Hybrid technology: charge the battery only when the hood is opened."
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      01-04-2021, 07:10 PM   #72
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Quote:
Originally Posted by SmartSaves View Post
I wonder why the hood needs to stay open for the X5 with 48v mild hybrid system (as mentioned on the owners manual). Now it appears door needs to stay open too! Very interesting.

"With Mild Hybrid technology: charge the battery only when the hood is opened."
What I noticed is when the hood is open, the 48v system will switch off. You can find that if you open the hood, then press engine start button three times, go to diagnostic mode, you will see the message of 48v off. My understanding is BMW wants to disconnect the 48v battery when charging 12v battery. But it's still a mystery why the vehicle needs to be unlock when charging the 12v battery, actually you don't need to keep the door open, just keep the vehicle unlock.
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      01-04-2021, 09:48 PM   #73
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Quote:
Originally Posted by tcbmhell View Post
What I noticed is when the hood is open, the 48v system will switch off. You can find that if you open the hood, then press engine start button three times, go to diagnostic mode, you will see the message of 48v off. My understanding is BMW wants to disconnect the 48v battery when charging 12v battery. But it's still a mystery why the vehicle needs to be unlock when charging the 12v battery, actually you don't need to keep the door open, just keep the vehicle unlock.
Good find and observation. So, leaving hood open, but with doors locked vehicle wouldn't charge? Doors must be unlocked as well?

It is a problem for owners who wants to store their vehicles long term, because leaving door unlocked wouldn't be very wise. Now they will need to unplug the battery to keep it healthy, effectively rendering Connected Drive app useless!
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      01-05-2021, 02:27 AM   #74
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Does the mild hybrid use 12 or 48 V battery for starting the engine? Does it have a 12 V alternator? Does it charge the 12 V battery from the 48 V battery or vice versa (or both?)
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      01-05-2021, 10:40 AM   #75
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Quote:
Originally Posted by tcbmhell View Post
I have connected my new NOCO charger for 27hours, still at 25% stage. I unplug it, unlock the vehicle, plug the charger and keep the the vehicle unlock. Hood is always not closed. Just after 20mins, the charger move to 50% stage... It seems that if the vehicle is locked, on-board computer or a sensor will prevent the charger from charging...
I am planning to hook the charger again tomorrow (Wednesday) night, will lock the door and see how the charging status behaves.
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      01-05-2021, 06:40 PM   #76
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24 hours have passed and Noco is still at 50% stage. I'm not sure now if lock the door will affect charging, will keep the charger hooked and see what will happen tmr.
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      01-05-2021, 10:07 PM   #77
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Quote:
Originally Posted by Frankj9000 View Post
Mine is the 2021 x5 40i with 48 volt mild hybrid. I had the same problem and exchanged the ctek charger for a new mxs 5.0. I have only charged it once but it worked as it should with no errors.
Hi Frankj9000, did you lock the car while it was charging?
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      01-06-2021, 12:17 AM   #78
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No. I did not.
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      01-06-2021, 07:01 AM   #79
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So far this is my understanding:

1. Hood must remain open for charging as per the owners manual (mild hybrid models only), doing this turns off 48v system.

2. Doors needs to remain unlocked, we don't know why. Physically opening door while charging the car might show the battery error message, we are presuming this wakes up the car and error ensues.

3. AGM battery is approximately 105 Ah.

4. BMW, CTEK, NOCO chargers work; but takes longer because charge rate is around 4 amp per hour. Also, cold weather slows down the battery charging rate.

Received the CTEK MXS 5.0 charger with 8' extension cable, it appears picture on the Amazon Canada is incorrect. I received the same one everyone else have. I do have another charger with selectable charging amps (4, 12, 25) and options that shows current, voltage, battery capacity etc. I'll test both.

Helpful post here if someone wants to route the extension cable with Eyelet semi-permanently:
https://g05.bimmerpost.com/forums/sh...php?p=25574804
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      01-06-2021, 07:45 AM   #80
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Update-

My NOCO still at 50% stage this morning, 36hours passed. I don't know if it works.

Here's a similar thread on G20

https://g20.bimmerpost.com/forums/sh...hlight=charger
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      01-06-2021, 09:10 AM   #81
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Quote:
Originally Posted by tcbmhell View Post
Update-

My NOCO still at 50% stage this morning, 36hours passed. I don't know if it works.

Here's a similar thread on G20

https://g20.bimmerpost.com/forums/sh...hlight=charger

If this is the first charge, or if you are charging after a super long time, then it may require to be connected for a longer period of time. I experienced more or less the same behavior with my newly delivered X5, was getting impatient after 30 hours or so and was disconnecting it. However, decided to leave it on, and after some time it went to stage 7.

I had my detailed experiences noted in the same thread, pasting it below for your reference. Also worth checking: https://g05.bimmerpost.com/forums/sh...7&postcount=64

-------------------
The battery of my BMW X5 XDrive 40i (MY2021) is fully charged now, or at least that's what the charger indicator is showing. This is what worked for me/I learned from the whole process -

I attempted with the BMW charger a few times, that did not seem to work. I then bought a CTEK MXS5.0, which did not seem to work in the first attempt. I tried again with the same CTEK charger, and it went to stage 7.

What I did differently that seemed to work -
I connected the CTEK MXS5.0 charger to the terminals under the hood, lowered the hood gently, did not close all the way, did not lock the car. I let the charger do its job without monitoring how many hours it's sitting on stage 3, or without frequently checking if the console had a Battery Management message. I did check once or twice though by opening the vehicle door, and that would activate the console and I would see the battery management message. I ignored the message and let the charger run its cycles.

It took well over 26 hours for the charger status to get to stage 7 and stay static on that stage.

That evening, I unplugged the charger and took my vehicle for a spin for about 100 miles, came back and hooked the BMW charger this time, and let it sit. It stayed on stage 3 for a couple of hours and then in about 4 hours it got to Stage 7 and stayed static at that stage.

This proved to me that the BMW charger is working fine, and would have done the job in the first place if I would have let it connected for whatever time it would have taken.


My Lessons learned -
Once the charger is connected, it needs to be left alone to do its job. The control message on Battery Management, at least in my case, only appeared if I woke up the system by opening the door, the message to me just meant that the system is not completely inactive even if it is attempting to do so. Depending upon what state the battery is in, it will take whatever time required to come up to stage 7.

I am keeping the BMW charger and returning the CTEK one.
----------------------------------------
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      01-06-2021, 09:25 AM   #82
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Quote:
Originally Posted by ChiefOne View Post
If this is the first charge, or if you are charging after a super long time, then it may require to be connected for a longer period of time. I experienced more or less the same behavior with my newly delivered X5, was getting impatient after 30 hours or so and was disconnecting it. However, decided to leave it on, and after some time it went to stage 7.

----------------------------------------
This's the first charge, I didn’t drive it much after the delivery in mid Dec. I'm gonna leave it on for more time.
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      01-06-2021, 09:28 AM   #83
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Quote:
Originally Posted by tcbmhell View Post
Update-

My NOCO still at 50% stage this morning, 36hours passed. I don't know if it works.

Here's a similar thread on G20

https://g20.bimmerpost.com/forums/sh...hlight=charger
Was your door unlocked this time?
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      01-06-2021, 09:32 AM   #84
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Quote:
Originally Posted by SmartSaves View Post
Was your door unlocked this time?
Unlocked.
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      01-06-2021, 11:41 AM   #85
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I have plugged in the charger again for the weekly charge, this time just to test, the hood is lowered, and the doors are locked, as compared to UNLOCKED last time.
Will see how it goes.
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      01-06-2021, 12:01 PM   #86
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Quote:
Originally Posted by ChiefOne View Post
I have plugged in the charger again for the weekly charge, this time just to test, the hood is lowered, and the doors are locked, as compared to UNLOCKED last time.
Will see how it goes.
Instead of lowering the hood, could you please leave it open this time? Not sure if it'll make a difference, just a thought. I presume your vehicle is garaged.
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      01-06-2021, 01:03 PM   #87
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Quote:
Originally Posted by SmartSaves View Post
Instead of lowering the hood, could you please leave it open this time? Not sure if it'll make a difference, just a thought. I presume your vehicle is garaged.
That part of the test I did the last time when I was going through the ordeal of the vehicle not charging as expected. In my observation, the charging state behaved the same when the hood was gently lowered as compared to completely open. This time, with the vehicle in a locked state, the charging stage jumped to stage 3 within minutes, has been sitting on that stage for close to four hours now. My plan is to leave it for about 10 hours, if it does not change then will unlock the vehicle and restart the process.
Yes, the vehicle is in the garage in my house.
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      01-06-2021, 01:25 PM   #88
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Thanks ChiefOne. Are these your sequence/steps?

1. Unlock the vehicle
2. Open the hood
3. Connect the output cables to (+) and (-)
4. Plug the charger to wall outlet
5. Leave the hood open
6. Lock the vehicle

Another observation: the 18 AWG wire on the CTEK charger is pretty thin IMO, it is enough to carry 4.3 Ampere current, but not heavy-duty built. During bulk charge stage (first 80%) the CTEK connectors could become very hot due to having thin cables, this will result charging voltage being lower than needed, for example the charging voltage for AGM battery could be just 14.1 Volts instead of 14.7 Volts as described. If you have access to charging voltage graph you'll see this. One remedy is to replace the connectors with thicker cables.

I tried the following charging calculator and it shows an estimate on how many hours it takes to charge. Temperature is a factor and it takes longer to charge the last 20% of the battery - known as absorption. First 80% bulk charging should happen quickly.

https://www.meracalculator.com/physi...harge-time.php
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