Hi guys,

 

Last week I had an over the air system update which resulted in the battery being at 5Volt in the morning after.

Had to jumpstart it, recharge, went to dealer, did battery check and they said it was still good and couldnt find a leak, so they think it was the system running when engine was off for the update.

 

However, now still seeing +/- 12.0V after 1hour parking the car.

 

Can I ask some of you to also measure the voltage on the battery after it being parked for lets say 1 hour?

 

I  am doing some tests, but if more cars are seing just 12.0V, batteries wont last long as normally it should sit arround 12.4-12.7 charged.

Guessing there are systems (maybe due to update) drawing current, which shouldnt be so much.

 

Hoping not to end up being parked somewhere with a flat battery.

 

I am also making another note about this to Skoda dealer so they can open a discussion with distributor/factory.

 

 

The long way involves a multimeter, fooling the vehicle that the bonnet is closed and a long wait for systems to close down.

 

The quick and easy way is to use a cheap plug in LED voltmeter in the accessory socket that can be read through the windows an hour or so after the car is locked.

 

Your battery will have been damaged by the discharge, not terminally but its life will be reduced, I did the same to mine by leaving the sidelights on (if it were headlights the BCM would have turned them off eventually) and my battery is weak, I have an LED voltmeter on all the time and I always check the voltage before getting in and starting, if its below 11v I will charge the battery before starting, it would probably start but would do further damage.

 

The more I read about the "characteristics" of the new vehicles the more I think people must be crazy to want to buy one let alone getting angry because the delivery is delayed, if they cancel their order they should thank their lucky stars.

Thanks for sharing your experiences. Do you have an mk4?

Just an update here as I still have loww voltage. After all systems are shut down battery voltage is 12.2V at nights at 10 degrees. It went down to 11 at freezing a bit.

 

Anyone with a VRS who wants to measure his voltage?

 

Attached 2 pics.

1st the factory battery. Clearly states AGM.

 

And 2nd is screenshot obdeleven.

Parameter on Wet. While it should be on fleece right?

 

Dealer states he does not see these settings with their tools. They do it with official battery program tool and only sees some digits during the learning process of a battery.

Also they state they can not use obdeleven or vagcom or vcds info to send to skoda factory for claiming.

1 hour ago, DutchVRS said:

Just an update here as I still have loww voltage. After all systems are shut down battery voltage is 12.2V at nights at 10 degrees. It went down to 11 at freezing a bit.

 

Anyone with a VRS who wants to measure his voltage?

 

Attached 2 pics.

1st the factory battery. Clearly states AGM.

 

And 2nd is screenshot obdeleven.

Parameter on Wet. While it should be on fleece right?

 

Dealer states he does not see these settings with their tools. They do it with official battery program tool and only sees some digits during the learning process of a battery.

Also they state they can not use obdeleven or vagcom or vcds info to send to skoda factory for claiming.

Hi Dutch, yes, that adaptation should read fleece. AGM charging voltage is higher than 'WET' battery type.

2 minutes ago, Warrior193 said:

Hi Dutch, yes, that adaptation should read fleece. AGM charging voltage is higher than 'WET' battery type.

But thats the strange thing..when measuring voltage while driving its always between 14.2 and 14.6V.

An AGM should not be charged much higher either right..?

Wondering if the 'fleece' option also changes the current of alternator..

AGM should be charging at about 14.7 volts - a lot will depend on how accurate the instrument being used to measure voltages is.

One strange thing that I discovered after owning and using my CTEK smart charger for almost a year was, at least in the case of CTEK chargers, normal AGM batteries should be charged using the same charging profile as WET ie EFB batteries, the CTEK AGM charging profiles are for special AGM batteries which have a different construction to normal AGM like used in our cars. After reading that info in the CTEK charger paperwork, I stopped using the AGM option when charging my normal factory fitted AGM battery in my Audi S4.

 

Charging voltages especially when measured using a cheap 12V DVM in a power socket, seems to indicate a lower voltage level with the engine off, than when measuring across the battery, though, on our VW Polo and Audi S4 I can only measure that when the ignition is one.

 

On either car, charging voltages tend to be the same as near as "damn it", getting up to even 15V on the over run at times - if the battery needs it or can accept it.

 

If that dealer can see/check battery data using their other battery coding tool, then surely they can confirm to Skoda that it was set up wrongly at factory - I do agree that the intention is always to code a normal AGM as "fleece", as I intend to use when I eventually need to replace the EFB in my wife's 2015 VW Polo with a normal AGM battery.

 

Edit:- I'm guessing that you know that the plan is just to keep that battery well enough charged to be able to restart that car the next time it is used, which tends to mean "quite low" battery voltage if you compare that with what you used to find with older cars.

Edited 28 March, 20224 yr by rum4mo

Well the Skoda/vw dealer here is not using any other diagnostic tool😬 

He doesnt want to add my read out stating 'wet' in obdeleven. As skoda factory doesnt care about that.

 

But still..in these new cars when all systems are shut down, an AGM should read 12.5 or higher when fully charged right?

 

When taking off a ctek charger after completely full this battery drops in 2-3 hours to 12.2volt.

 

I have also a wireless measurement device on my battery mounted.gives same values as my fluke meter.

Hello, possible that your battery going down to +- 5 volts overnight has damaged it - I'd be inclined to think the Fluke (DMM ?) readings as likely to be accurate.   

On 28/03/2022 at 19:42, DutchVRS said:

Well the Skoda/vw dealer here is not using any other diagnostic tool😬 

He doesnt want to add my read out stating 'wet' in obdeleven. As skoda factory doesnt care about that.

 

But still..in these new cars when all systems are shut down, an AGM should read 12.5 or higher when fully charged right?

 

When taking off a ctek charger after completely full this battery drops in 2-3 hours to 12.2volt.

 

I have also a wireless measurement device on my battery mounted.gives same values as my fluke meter.

One thing, but maybe not your initial fault, I've found that a CTEK smart and expensive charger, can quietly go into a "safety operating mode" - which is a lot better than it over charging - but it can leave you with an under charged battery, I've forgotten what the lowest quoted charging voltage is, very probably round 12.4-12.6V it will be on the booklet with the charger as well as on their website! This seems to happen when you believe the instructions that when you switch it off - the next time you use it, it will automatically operate in the same mode, well the indicators will confirm that, but if you connect a voltmeter across the charging leads, you might just find the charging voltage is fixed throughout the charging profile, to the safe minimum level - been there done that and considered that it was U/S, though after cycling it through the different modes, it started working okay again - just a warning, nothing else!

Thanks for the insight!

I monitored the cycles of the CTEK and mine used actually goes first upto 14.8V, than slowly goes down, and end cycles remains at 13.6V.

 

Now booked a service for 10th of May, earlier not possible. lets see what they say.

I still strongly have the idea that my battery was damaged from that 1 night draining to 3Volt.

If I now read out battery voltage (car parked for 10 hours) 12.2V and its not even cold.

 

As the dealer says with their tool the dont see if settings are on ''wet'' or ''fleece''.

Would you do the change to fleece yourself with OBD?

Your dealer's battery diagnostic's should be, at least as good as a Hex-V2 VCDS.

Your battery seems to be recoded as the original serial number on all the batteries ends in 1, you just change any number on battery renewal.

When I looked at battery adaptation for a AGM, it gave two choices, AGM Binary or Fleece.

You can see from my log that the battery voltage at rest is 12.5V or ~ 80% SOC, 12.2V, IF taken at rest is probably ~ 55% SOC. but the battery voltage should really be taken "open circuited" for a accurate reading. I don't know how VCDS derives the at rest voltage. It shows a usable battery charge of 28AH in the 59AH, 3 year old battery, this is based on VAG's 50 X battery capacity, in this case, 2950AH and MAS06087 says total charging throughput was 1468AH so remaining, theoretically anyway, battery capacity is 59*1482/2950, 29.4AH so there or there abouts, apparently, when when the calculated MAS06086 reaches the actual measured  charge throughput, MAS06087 then the BMS system starts shutting down non essential items such as stop/start.

I charged my battery for 1 hour with a smart charger and it showed that the battery is/was close to  its maximum SOC of ~ 80% which is par for the course I would think for regenerative alternator charging which will charge up to 15V on car overrun and 12.8/13.5V normally.

 

I would advise you to borrow VCDS from someone to get a reasonably accurate feel for your battery condition but if it is falling as low as 11.0V (when freezing) then I would be concerned.

 

14:58:57 24/1/2022 Polo AW1 registered 03/01/2019. Build date August 2018 (Engine OFF)
IDE01834 Battery voltage 12.166 V
IDE01836 Battery current -4.386 A                  (mainly from the DRLs)
IDE01837 Temperature of battery sensor 12 °C
IDE01839 Battery charge level 79 %
IDE01841 Battery internal resistance 7.8 mOhm
IDE01842 Usable battery charge 28 Ah
IDE01843 Battery voltage at rest 12.5 V
IDE07681-MAS06086 Battery total charging throughput-Total re-charge 1354.8 Ah
IDE07681-MAS06087 Battery total charging throughput-Entire energy throughput 1478.3 Ah

19:25:42 24/1/2022 after 1 hour charge.
IDE01836 Battery current -5.689 A
IDE01837 Temperature of battery sensor 16 °C
IDE01838 Battery temperature 16 °C
IDE01839 Battery charge level 82 %
IDE01841 Battery internal resistance 7.6 mOhm
IDE01842 Usable battery charge 30 Ah
IDE01843 Battery voltage at rest 12.5 V

 

 

IDE03256-MAS06105  Battery adaptation-Rated battery capacity 59 Ah

 IDE03256-MAS06106  Battery adaptation-Battery technology EFB 

 IDE03256-MAS06107  Battery adaptation-Battery manufacturer JCB 

 IDE03256-MAS06108  Battery adaptation-Battery Serial Number 1111111111 

 

Open circuit battery voltage (lead acid?)

 

Volts	Capacity %	volts/cell
11.51	10	1.918
11.66	20	1.943
11.81	30	1.968
11.96	40	1.993
12.10	50	2.017
12.24	60	2.040
12.37	70	2.062
12.50	80	2.083
12.62	90	2.103
12.73	100	2.122

 

 

 

 

Edited 2 April, 20224 yr by Johngerard

Yes, I agree with all the above, though I thought that at least Skoda and maybe SEAT actually did code their batteries correctly in the factory - I do know from checking a few VWs that they don't seem to bother so everything goes out with "JCB" and "1111111111"   - so as suggested above, that car's battery system does look a lot like it has already been recoded from "1111111111" to "1111111112" and maybe even the "fleece" changed to "EFB", so yes, I'd try changing that battery serial number back to "factory setting", ie "1111111111" and change the technology from "EFB"  to "fleece" - just changing it to "fleece" might force the battery to be seen as a new one, but just to be sure, change the serial number to anything other than what it is presently - so why not change back to "1111111111" the actual value of the serial number or its changed value means nothing to the battery system, it is changing it that forces the battery system to restart the battery learning system.

 

If you are worried about your Skoda dealer discovering that you have made battery setting changes, just do as I suggest, then a day later change the serial number back to "1111111112" as that will have it back to what the garage changed it to and still prompted the battery system to "restart" it's new battery learning.

Short update, today the car went in at skoda service. They admitted that last time battery learning was not give the correct settings. Now they did it again, and say its on fleece setting.

Lets see if this helps that floating voltage to get up again...I started discussion on that this AGM battery was charged wrong almost for a year.

They didnt want to show any CCA measuring results...they simply do not want to spend more time on my car. If the battery passed the minimum level, they cant claim battery replacement.

 

Ps. due to all SOS pop ups and traffic assist pop ups, they checked my car and I will get a new steering wheel :S

 

Ps. the engine cover I handed over, they did not see any replacement announced...pfff now I have to find official Skoda communication about this.

What Battery Serial Number and Battery Technology is the  obdeleven indicating since recoding?.

Hi, see attached after the recoding by Skoda.