On 16/02/2020 at 14:14, rum4mo said:

 

Hi, can you remember which "battery technology" option you selected in the CAN - Gateway when you changed to AGM, I'm asking as I've looked at the options in a 2015 VW Polo 6C and there are a lot of options, the ones that seem close to what I should select are "Fleece" , "GEL" and "binary AGM".  Thanks.

 

Edit:- I'll remove GEL from that option list, so is it "Fleece" or "binary AGM".

AGM is coded as fleece. The binary AGM is totally different kind of battery .

https://forum.obdeleven.com/thread/2041/battery-replacement

 

https://forum.obdeleven.com/thread/4252/coding-new-battery

 

I used this guide for when I changed my battery over last year, I went from an EFB to a AGM & changed the following:

Rated battery capacity:

Battery manufacturer:

Battery serial number:

Battery technology: I left as Fleece.

 

My start/stop has been working faultlessly no issues whatsoever.

 

You will get a few error codes pop up on the dash board etc once you change the battery over, code it, then go for a 10 minute drive, read the fault codes again & you will find all should be fine...

Edited 15 March, 20215 yr by BATVANVRS

On 15/03/2021 at 11:49, BATVANVRS said:

https://forum.obdeleven.com/thread/2041/battery-replacement

 

https://forum.obdeleven.com/thread/4252/coding-new-battery

 

I used this guide for when I changed my battery over last year, I went from an EFB to a AGM & changed the following:

Rated battery capacity:

Battery manufacturer:

Battery serial number:

Battery technology: I left as Fleece.

 

My start/stop has been working faultlessly no issues whatsoever.

 

You will get a few error codes pop up on the dash board etc once you change the battery over, code it, then go for a 10 minute drive, read the fault codes again & you will find all should be fine...

 

So your car came from factory with an EFB battery and the coding set for "fleece" - now that is a slightly weird one, my only worry is, when I need to replace the battery in my own car, a 2011 Audi S4, I have bought a Bosch AGM to replace a same size Varta AGM, and I don't think that VW Group include Bosch as a battery manufacturer - so there will not be a manufacturer code for that, though Bosch batteries are manufactured by Varta so leaving it alone might be the best option. So far my wife's August 2015 VW Polo 1.2TSI 110PS's EFB battery is still for use.

 

Having read about many people buying one of these 12V DC DVMs that plug into the ex-ciggy lighter socket, I eventually dived in and bought one, previously I had checked using a made up plug with flying leads and a DVM, under driving demanding power and driving on the over run and braking, so I had witnessed what is normally going on.  So when this plug in DVM arrived, I checked it on my S4, it had previously been connected to a CTEK charger for maybe 14 days, initially I drove up a long hill and the voltage reading just dropped down towards 12V, on the other side of the hill and so on the over run, as expected it indicated that the battery was being charged back up varying from 13.5V up to 15.0V, same on the way home, that car does not have Stop/Start but has "regenerative braking" and its original AGM battery when tested returns a very close to new CCA figure - though I know nothing about its ampere hour storage capacity. On the other hand, when I carried that check out on my wife's 2015 VW Polo 1.2TSI 110PS yesterday, again it had been connected to a CTEK charger since last Friday, during the driving up the same long hill, the battery charging voltage remained over 13V and when on the over run it varied between 14V and 15V, that battery is the original EFB battery and its tested CCA is maybe only 75% of its rated CCA when new. The one issue could be that the 2011 Audi S4 has an earlier version of smart charging than the 2015 VW Polo, if that is not relevant then does this indicate that the Polo's EFB being in poorer health is needing a higher charging voltage than the older S4's AGM battery which claims to be in better health by way of its tested CCA value wrt to design rating?

 

Edit:- my logic being that as the plan nowadays is to only use power to charge a battery if it really needs it, the Polo seems to need it right away from being started with a fully charged battery - and the S4 under the same starting conditions, was quite happy to run the battery down and only recharge when on the first over run conditions, it would have better if I had continued driving that S4 briskly until its battery voltage dropped below some previously determined level, and that even under power, the system reverted to allowing the battery to re-charge back up.

 

Another Edit:- that Polo still auto Stops if allowed to do so, and even after a short run from cold.

Edited 18 March, 20215 yr by rum4mo

2 hours ago, rum4mo said:

 

So your car came from factory with an EFB battery and the coding set for "fleece" - now that is a slightly weird one, my only worry is, when I need to replace the battery in my own car, a 2011 Audi S4, I have bought a Bosch AGM to replace a same size Varta AGM, and I don't think that VW Group include Bosch as a battery manufacturer - so there will not be a manufacturer code for that, though Bosch batteries are manufactured by Varta so leaving it alone might be the best option. So far my wife's August 2015 VW Polo 1.2TSI 110PS's EFB battery is still for use.

 

The manufacturer of the battery does not matter. You need to make sure it is coded as fleece for AGM batteries, that it is set at the correct amps for the battery spec and just alter the serial number by one digit to tell the ecu a new battery has been installed.

I replaced the AGM battery on my car 2 years ago. £140 for a Yuasa, supplied and fitted. Mechanic said it didn't really need coded in but he did it anyway.