I have searched this forum and the internet with no definitive answer.

2017 JCW 2 door.

Is the factory battery size H6 or H7

None at the dealer and it looks like I will install myself.

Thanks!

 

I bet its an H7.
From what Ive seen S and JCW use H7, and 3 cal use H6

 

Thanks so much

 

Dont forget to "register" the battery as new with the ECU.
Or you will end up with an overcooked battery within weeks.

There are plenty of threads relating to that.

Also there's a good DIY on YouTube on replacement

 

that video is very helpful thank u

 

Also look at the second half of this video

 

https://fb.watch/dgkRBAdYi4/

 

Tell us what is on the link, for we who do not participate, nor click any Facebook link.

 

H7 fit. A friend reset it at his garage