Volkswagen Passat Forum banner

Foxwell NT510 VAG software, need help with battery adaptation

179 Views 6 Replies 3 Participants Last post by  KHedges
I'm trying to use the Foxwell NT510 (Schwaben branded, ECS Tuning) with VAG software to perform battery adaptation on a Interstate battery from Costco (not Kirkland)... not actually on a Passat but I'm guessing a Mk7 Golf will speak the same VAGCOM as a Passat and have the same battery management. I think it has Stop/Start.

I selected the new storage rating (70 Ah), tried to select "Other" as the manufacturer, entered a fake serial number of 111111112, and didn't get a prompt for the battery type. (Was expecting to see "fleece" for AGM. Need to look at her old battery again, which is in my car waiting to do a core exchange.)

It asked for confirmation, OK, then rejected the input.

Anything obvious I'm doing wrong? Should we just find a Costco with a direct replacement (not upgrade)?

Previous Owner had installed some random generic battery with fairly low capacity, date code some time in 2020. IDK if Previous Owner bothered doing adaptation. Current Owner (a neighbor) bought it last year. It's been showing signs of battery age, especially if she doesn't drive for a few days, and the consensus of everyone she asked was the battery needed replacement.

BTW, she loves her Golf but is disappointed in the mileage: fancy new 2017 car with a 1.8L engine that gets only about the same mpg as a B5 2.8L Passat.
1 - 7 of 7 Posts
Not too familiar with the Foxwell, but did you copy information under "display battery information" about the new battery? It should tell you amp hours, manufacturer, serial number etc.
Thanks! I looked at that screen and it just said it couldn't read the battery. (paraphrased)
I put in an AGM battery in my Mk7 Golf R last fall. I have a VAGCOM and battery type was one of my choices for my adaptation and I changed it to fleece. The car will adapt to the new battery without the adaptation. One difference would be the AGM can be charged to a slightly higher voltage which I assume the car does when you change the battery type to fleece. I think you got rejected because the serial number was too short. Ross-Tech says serial number is 10 digits. Battery Replacement - Ross-Tech Wiki
I put in an AGM battery in my Mk7 Golf R last fall. I have a VAGCOM and battery type was one of my choices for my adaptation and I changed it to fleece. The car will adapt to the new battery without the adaptation. One difference would be the AGM can be charged to a slightly higher voltage which I assume the car does when you change the battery type to fleece. I think you got rejected because the serial number was too short. Ross-Tech says serial number is 10 digits. Battery Replacement - Ross-Tech Wiki
Thanks! Was it an H5 or an H6? If it was an H6, did you have any issues with the battery not wanting to sit flat in the battery tray? It looked flat when I installed it, but the car was parked at the curb on quite a slant from the crown in the road. After she moved the car, it was obviously tilted. (At least an AGM battery isn't going to leak electrolyte if it isn't flat.) I thought I counted 10 digits but I may have been off when I was trying it--I was rushing because I was trying to squeeze in this favor between two other events.

My Foxwell scanner didn't give me any options for battery type--there was no place to select "FLEECE" as I was expecting to see. Is that what happens if you try to enter a serial number with less than 10 digits by accident?

When I was reading about battery swaps, a lot of the more experienced folks were saying that the problem with not doing adaptation is that the battery management will not realize there is a new battery with different charging needs than an old worn-out battery. Using that charging pattern on a new battery will wear it out prematurely. (Which could be why a Golf with 60,000 miles is on its third battery. I'm replacing one that is clearly NOT original to the car.) I don't know if it learns eventually, but she can't afford a new $180 battery any sooner than necessary.
See less See more
I got this battery on sale with a 4 year warranty: https://www.batteriesplus.com/productdetails/sli47agm My wife's Mazda CX-7 goes through a battery every three years. Batteries close to turbos get abused pretty bad. Nice thing is she bought a Mazda one with a 4 year warranty the first time and every one since has been a free warranty replacement.

Ross-Tech's site says you'll get a fail if the number of digits is wrong. Watching the Ross-Tech video it seems not all VAG cars support battery type since not all have the option.

I understand the overcharging opinion but the car is still monitoring voltage and shouldn't overcharge even the new battery.
I know my 1999 C5 A6 doesn't have the option. However, the Golf forums definitely discuss this option working on a Mk7.
  • Like
Reactions: 1
1 - 7 of 7 Posts
Top