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How to retro-fit a bigger capacity battery to a Mk7 Golf

yeahforbes

Ready to race!
Location
NJ
Car(s)
2017 Golf R DSG

yeahforbes

Ready to race!
Location
NJ
Car(s)
2017 Golf R DSG
Based on the VIN, it was made in Germany for the NAR market.
 

golfdave

Autocross Champion
Location
Scotland (U.K.)
Car(s)
Mk7 Golf GT Estate
My factory fit battery, which just died at 43k (4.5 years since in-service date), is this 59Ah/320A, H5 size, EFB type: https://parts.vw.com/p/Volkswagen__/Vehicle-Battery/75737446/1S0915105A.html


Which is in the list of batteries fitted to vehicles with eco stop start:-

For cars WITH "Start/Stop” eco engine shut off (BlueMotion II):-
59Ah/320A (DIN), H5 size, EFB type
69Ah/360A (DIN), H6 size, EFB type
68Ah/380A (DIN), H6 size, AGM type

Based on the VIN, it was made in Germany for the NAR market.


As I said.....just it looks odd that an EFB was fitted & not a wet type when that is an option.....maybe the German factory only fits EFB or AGM batteries as that's the bigger fitment requirement due to eco stop start being on most of cars that leave that factory.....wet type for factories in places that don't spec eco stop start like Mexico...
 

yeahforbes

Ready to race!
Location
NJ
Car(s)
2017 Golf R DSG
odd that an EFB was fitted & not a wet type when that is an option.....maybe the German factory only fits EFB or AGM batteries as that's the bigger fitment requirement due to eco stop start being on most of cars that leave that factory
That's exactly what I'm thinking. I just called my local dealer which has a parts/service special for a "VW economy battery" (JZW-915-105-DSP or JZW-915-105-A-DSP) for $139 installed, but they said their system doesn't show it as a match for my car. Whatever the system shows as a match is not in stock, and I need a battery today.

Is it safe to say that my lack of Eco Start Stop means that I can get away with downgrading to a wet type without any problems? If so, I'm either going to argue for whatever they do have (I'll install it myself and re-code if for some reason they won't) which is hopefully H5, or go with the H6 Walmart/Costco options and do the ebay heat shield next week.
 

golfdave

Autocross Champion
Location
Scotland (U.K.)
Car(s)
Mk7 Golf GT Estate
That's exactly what I'm thinking. I just called my local dealer which has a parts/service special for a "VW economy battery" (JZW-915-105-DSP or JZW-915-105-A-DSP) for $139 installed, but they said their system doesn't show it as a match for my car. Whatever the system shows as a match is not in stock, and I need a battery today.

Is it safe to say that my lack of Eco Start Stop means that I can get away with downgrading to a wet type without any problems? If so, I'm either going to argue for whatever they do have (I'll install it myself and re-code if for some reason they won't) which is hopefully H5, or go with the H6 Walmart/Costco options and do the ebay heat shield next week.

The list of batteries for cars with & without eco stop start is from VW's own info on the MK7 Golf..& that lists wet types as a possible fitment for MK7/7.5 Golfs without eco stop start...as I stated...
 

yeahforbes

Ready to race!
Location
NJ
Car(s)
2017 Golf R DSG
Perfect, thanks. Finally found a Costco with H5 in stock (60Ah wet) so it looks like I'm all set: avoiding the stealership, avoiding the unnecessary EFB, avoiding a heat shield replacement. Woot!
 

division12

New member
Location
US
Hi gofdave..thanks for this informative post..however, what if the new battery doesn't say the exact AH (Amp Hours)? How do you code it in VCDS?
 

golfdave

Autocross Champion
Location
Scotland (U.K.)
Car(s)
Mk7 Golf GT Estate
Hi gofdave..thanks for this informative post..however, what if the new battery doesn't say the exact AH (Amp Hours)? How do you code it in VCDS?
It should say it on the case..if not then check the manufacturers website..
 

rowdyzombie

Ready to race!
Location
Plano, TX
Thanks Golfdave for the write up on this. I put in this huge H6 AGM Duracell 760cca/70a today, on vcds recoded to 70ah, fleece, and added a digit to the serial. I kept the old cover on (one inch gap on ecu side) and also added the larger411h cover so it has double insulation. I like a challenge ha.

I had to really work to make this fit with the APR open intake and I even have a positive wire going to the trunk for amplifier.

Here’s a picture to show the tight fit.
 

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