12-31-2020, 05:33 PM | #45 |
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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.
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12-31-2020, 07:13 PM | #46 |
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The MXS 5.0 I received from Amazon is the same as zhangyi17 posted. I notice it's different with the pics on Amazon. Could you take a pic of your exchaged charger?
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01-01-2021, 09:20 AM | #48 |
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Never understood the obsession that Americans have with trickle chargers. Never used one, never had any problems - even when not using the car for a month or two.
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01-01-2021, 09:23 AM | #49 |
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I've had problems in cold weather with my F11 - after driving on highways for over an hour, the car reported "battery low, recharge immediately" or something like that. The battery doesn't accept much charge when it's cold and there's nothing to warm it up under the boot.
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01-01-2021, 09:55 AM | #50 |
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Good. We are happy for you In northern freezing cold climates it is not an "obsession" rather a "necessity". You don't want to know how it feels when the vehicle doesn't start first thing in the morning!
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01-01-2021, 10:20 AM | #51 |
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Just as a point of reference. I brought car home from dealer. After a couple hour drive I checked battery voltage and it was at 12.92 volts (agm battery) Car sat in garage for 2 1/2 weeks without being started or run. Battery voltage was at 12.26 volts.
Car was completely shut down. So state of charge went from just just short of 100% to a little more than 60% in a little under 3 weeks. With all the electrical components in the 2021’s I think a trickle charger is now an essential item. Unfortunately. Last edited by Frankj9000; 01-01-2021 at 10:27 AM.. Reason: Grammar and spelling |
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01-01-2021, 11:04 AM | #52 |
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Battery voltage (and required charging voltage) depend heavily on temperature, see eg. https://shop.pkys.com/AGM-Battery-Re...arameters.html One problem is that the car doesn't use high enough voltage in cold temperatures, so the battery is never fully charged. Another problem is that (to save a few grams of CO2) the car may only charge the battery while coasting or braking. Well, I hope it helps to save at least one polar bear..
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01-01-2021, 11:50 AM | #53 | |
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01-01-2021, 11:56 AM | #54 |
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01-01-2021, 12:08 PM | #55 |
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01-01-2021, 12:43 PM | #57 |
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Does this make a difference? Any reference?
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01-01-2021, 12:55 PM | #58 |
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01-01-2021, 03:22 PM | #59 | |
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Thank you, I think I will learn about it and will invest in a multimeter.
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01-01-2021, 03:28 PM | #60 |
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Updates -
The first attempt to charge the battery with a newly acquired CTEK MXS5.0 was stuck at stage three for about 18 hours. I disconnected the charger and took the vehicle out for a spin. I plugged it again overnight, with CAR AGM mode selected, it switched to stage three within minutes. And has stayed on that status for about 16 hours now. I am planning to leave it connected for a couple of days, if needed, just to see if the status changes. Few things I noticed, while the car is connected to the charger and is in an unlocked position with the hood open, for at least about the first 14 hours I would see the Electronic Parking red light and the hazard switch red triangle on. Now I see that those lights are off. Not sure if that means that the car battery is completely depleted while attempting to charge. Have not opened the door or tried to see the control message status.
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01-01-2021, 04:02 PM | #61 |
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Most everything in a modern BMW is not controlled directly with switches, but by messages sent to/from a computer. If you were to take the headlight switch assembly out, you'd see that the wires going into it a quite small gauge, nowhere near big enough to actually switch power to anything directly, and, considering the quantity and diversity of the lighting possibilities, nowhere near complex enough, but it works. The switch sends messages to the computer which then sends out messages to things closer to the device to actually control it.
But, when you shut the vehicle down, if a module does not get the message, rather than drawing almost nothing, it could continue operating in its normal mode, and draw down the batteries. The vehicle does keep certain things in the 'ready' state, but if there's no activity for awhile (often days, sometimes weeks) or if the battery level drops, it shuts down more. Why do this? I'm sure I'm not cognizant to all of the reasons, but one is flexibility, another is minimizing the number and gauge of wires needed to be run around the vehicle which saves money and weight, which helps with efficiency. They can use common modules, and just program them differently for different applications. |
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01-02-2021, 08:55 PM | #62 | |
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01-03-2021, 10:15 AM | #63 |
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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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01-03-2021, 10:28 AM | #64 |
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On a somewhat related note, on the day of the delivery, I think the BMW Center botched-up my delivery steps and that has resulted in this poor battery state. I found a checklist tucked in the user manual, and it has mostly unchecked line items. To me, it says, either the checks were not performed or were not accurately noted.
To anyone taking delivery of a new vehicle, my suggestion is to ask for the checklist and make sure the line items are checked and explained to you if completed. There is one item specifically that I think caused this whole issue, is BMW Battery Care SI B61 18 08, which is not checked in the checklist along with many other items. I have some snippets, I will attach a complete picture of the checklist shortly. I think my vehicle battery was at a very low voltage state when it was delivered, and I was not even informed or assisted in getting it up to a ready state. Because there is no other reason It would have taken close to 12 + 24 + 15 + 30 hours for the charger to run and get the battery to full state. I have had the vehicle for about 3 weeks now, I did not do any coding, nor did I use the electronics much while the vehicle was not running.
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01-03-2021, 01:25 PM | #65 | |
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Last edited by tcbmhell; 01-03-2021 at 01:33 PM.. |
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01-03-2021, 07:39 PM | #66 |
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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. That's going to take a LONG time considering there is some (small) constant load on it to keep some modules at least in standby mode. OPen up a door, activate many things, and the load goes way up, at least for awhile.
If it's down that far, a regular battery charger might be better to get it up to at least near full, then deal with the tender. I opted for the Bosch unit as it has several other features like battery restore, battery hold up (if you're doing maintenance and want to hold memory), and will charge at about double what most tenders do, up to 7A. https://www.boschautoparts.com/en/au...martcharge-pro |
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