Battery Protection Limit

[Johnnyboycar]

Hi all,
I keep getting around 15 notifications a day from the app saying that the battery protection limit has been exceeded. I don’t really even open the app so can’t understand why I’m getting these notifications it’s crazy. Does anyone have any ideas?
Most times I try to unlock the car via the door handles it doesn’t work.
2024 Enyaq 85x Sportline Coupe

[Skku]

Same here ..got a few less message when I uninstalled the app (beta version) and installed another version of the Android app.

[Johnnyboycar]

Same here ..got a few less message when I uninstalled the app (beta version) and installed another version of the Android app.

I’ve tried both android and iPhone and get at least 10 messages a day. It’s the most glitchy thing I’ve owned.

[Johnnyboycar]

I’m starting to wonder whether it’s because I only give say 10% to 20% charges at a time. I wonder if the 12v battery only charges properly when given a long stint on the home charger, I don’t know enough about the car to know whether it charges the battery when not connected to a charger.
It seems bonkers that a tiny 12v battery gets low when it’s sitting in a vehicle with a huge amount of electrical power that could easily keep it topped up.

[RichR]

12V battery only charges when the car is in the Ready state (ie ‘ignition’ on). Some EVs will periodically connect the traction battery to charge it - but there are legal requirements to keep it isolated when the car is unattended so I assume VW decided not to implement that due to the extra testing that would be required to get Type Approval.

[CrowSysE243]

12V battery only charges when the car is in the Ready state (ie ‘ignition’ on).

Although this was the case in the past, as far as I could see, recently I had noticed evidence that the 12V battery was being charged during HV battery charging and I have been able to confirm this is happening while investigating a battery protection limit problem. Over a period of just over 40 minutes charging the car the HV battery added about 6% while the 12V battery state of charge increased by over 30% adding over 6Ah as shown in the following CarScanner screenshots.

The car major software version has not changed from 3.5, however there have been some lower level updates and I think I read something about a change to 12V battery charging, but cannot find it at present.
I did not receive a notification that there had been a battery protection limit activation but did receive a notification that Octopus had not been able to control the car so looked in the MySkoda app for the first time that day and found the warning.

I have all the notifications enabled in the app, but the only notifications that I have ever received are for charging completion.

As the "Battery protection" indicates that it is for notifications about how to extend the battery life I had assumed that this related to the HV battery, rather than the 12V battery protection limit. I had assumed that the Battery Protection Limit is a function implimented in the Skoda servers and that it inhibited wake up messages being sent to the car if there had been too many recently.
The recently introduced option in the app to prevent using the app waking the car up automatically appears to work as I had expected

I tried using the app several times during a day when I had not been using the car, with a gap between each use to allow the car to go to sleep. The first three times the car was shown as being on line shortly after opening the app. On subsequent attempts the car did not come on line unless I changed a setting such as the charging limit. Accessing the app and waking the car more than 3 times did not cause the battery protection limit to be activated.

I have not been able to get to the stage where the battery protection limit behaviour is predictable.

Last winter it occurred several times, sometimes after overnight Intelligent Octopus charging but a few times before charging. I had seen guidance that the limit was reset when the car was driven and most of the time this worked but 1 time it didn't and I resorted to using scheduled charging instead. It has only occurred once since last winter and in this case I restarted charging manually at 23:30, the limit cleared and the 12V battery charged as well. I will continue to experimet to see if I can get sufficient understanding to be able to predict, and hopefully prevent, battery protection limit activation. Any suggestions would be welcome.

[Aragorn]

12V battery only charges when the car is in the Ready state (ie ‘ignition’ on). Some EVs will periodically connect the traction battery to charge it - but there are legal requirements to keep it isolated when the car is unattended so I assume VW decided not to implement that due to the extra testing that would be required to get Type Approval.

Not just Ready mode...

If the HV contactors are closed, the DC-DC converter is on and charging the 12v.

So any charging (AC or DC), preheating etc will all also be charging the 12v battery.

[Johnnyboycar]

12V battery only charges when the car is in the Ready state (ie ‘ignition’ on). Some EVs will periodically connect the traction battery to charge it - but there are legal requirements to keep it isolated when the car is unattended so I assume VW decided not to implement that due to the extra testing that would be required to get Type Approval.

Rather annoying of VAG if that is the case

[RichR]

Aragorn - yes, you're correct. Though I suspect most charging is done when the car is Ready and driving.

Johnnyboycar - it looks like the behaviour may have changed on more recent software and hardware versions. I know in my car (ME 3.2 now, was originally ME 2.6) it doesn't seem to do it.

[Johnnyboycar]

12V battery only charges when the car is in the Ready state (ie ‘ignition’ on).

Although this was the case in the past, as far as I could see, recently I had noticed evidence that the 12V battery was being charged during HV battery charging and I have been able to confirm this is happening while investigating a battery protection limit problem. Over a period of just over 40 minutes charging the car the HV battery added about 6% while the 12V battery state of charge increased by over 30% adding over 6Ah as shown in the following CarScanner screenshots.
Screenshot_20241114-084218.png
Screenshot_20241114-090925.png
The car major software version has not changed from 3.5, however there have been some lower level updates and I think I read something about a change to 12V battery charging, but cannot find it at present.
I did not receive a notification that there had been a battery protection limit activation but did receive a notification that Octopus had not been able to control the car so looked in the MySkoda app for the first time that day and found the warning.

I have all the notifications enabled in the app, but the only notifications that I have ever received are for charging completion.
Screenshot_20241114-091524.png
As the "Battery protection" indicates that it is for notifications about how to extend the battery life I had assumed that this related to the HV battery, rather than the 12V battery protection limit. I had assumed that the Battery Protection Limit is a function implimented in the Skoda servers and that it inhibited wake up messages being sent to the car if there had been too many recently.
The recently introduced option in the app to prevent using the app waking the car up automatically appears to work as I had expected
Screenshot_20241114-091603.png
I tried using the app several times during a day when I had not been using the car, with a gap between each use to allow the car to go to sleep. The first three times the car was shown as being on line shortly after opening the app. On subsequent attempts the car did not come on line unless I changed a setting such as the charging limit. Accessing the app and waking the car more than 3 times did not cause the battery protection limit to be activated.

I have not been able to get to the stage where the battery protection limit behaviour is predictable.

Last winter it occurred several times, sometimes after overnight Intelligent Octopus charging but a few times before charging. I had seen guidance that the limit was reset when the car was driven and most of the time this worked but 1 time it didn't and I resorted to using scheduled charging instead. It has only occurred once since last winter and in this case I restarted charging manually at 23:30, the limit cleared and the 12V battery charged as well. I will continue to experimet to see if I can get sufficient understanding to be able to predict, and hopefully prevent, battery protection limit activation. Any suggestions would be welcome.

I think I know what is happening then. I’m on intelligent Octopus and when I get my charging slots, there maybe upwards of 6 times where it starts the charge and then stops. The car would then take time to enter deep sleep mode and then be reawakened on each occasion to charge. One would assume that the multiple times it wakes and then sits there waiting to go into deep sleep would take its toll on the 12v battery, as some charge slots are very short and with low current.

I think the only way around this is to switch off smart charging and just schedule it within the cheaper rate time of 2330 to 0530.