It's an Exide EK151.
I couldn't find any on Fleabay other than this one from Poland: https://www.ebay.com.au/itm/BATTERY-EXIDE-EK151/264052209448?epid=248970190&hash=item3d7abcf728:g: KZYAAOSww7tb9LRZ:rk:2f:0
But maybe you can get one for cheap from a local battery shop or auto parts store.
The best solution by far though is to simply disable the pesky stop/start system, just unbolt the end of the earth lead (which runs from the negative terminal of the stop/start battery) from where it bolts to the floor of the trunk and zip tie that end up out of the way. Very quick and easy to do and zero cost!
Or else completely remove it from the car which it looks like you may have done already.

 

Yes thanks, but Poland? Is there no domestic (US) seller?

 

Dunno, but now that you know which exact battery you need it would be much easier for you then me to find a US seller!
That said, judging from the Fleabay listings and Interwebz pages for Exide it seems they are very much a UK company and possibly do not have a US distributor.
Maybe there is some way you can search for a US made equivalent for the EK151?

 

I think you guys are over-thinking this. If you provide the dimensions, I can give you the compatible series/size in a motorcycle battery. Better yet, spend about $230 and get a lithium replacement battery for extra life and 10+ pounds in weight savings (probably more).

 

Just for grins, does anyone know if my MY 2018 base model has a second battery? If it does, I can't find it.

 

You don't have one, only a single battery in MY2018. Or mine's been stolen, too!

 

But if you're looking to disable the auto stop/start, the new models have a much easier way...

 

I'm listening, but it's ingrained now: Start engine, press #3 memory button, engage dynamic mode, press eco-start disable button, at first placement in "drive" move gear shift level to "sport." Enjoy!

 

Here you go:

https://www.jaguarforums.com/forum/f...attery-146010/

I did this about a week into ownership.

 

Measurements in mm's...

 

 

My start stop battery is out agian. Had it replaced under warranty and would get a pro rated price for new one. But I have come around to just forgetting it as I was urged to last time. question is can i just leave it or should I disconnect ground?

 

I found the right battery size and rating, but they all have the wrong type of terminals. That said, I would personally use an MC battery and change the cable connectors. Fortunately, my car isn't afflicted with the secondary battery.

 

Assuming by "out" you mean "not working" as opposed to "has been removed from the car", and the secondary battery is still in the car and wired up but simply not working, I would disconnect the earth/ground lead.
If you don't the stop/start system could decide to start working again intermittently and/or when you least want or expect it to and cause all sorts of hassles.

 

Use a longer screw or bolt to attach to the battery. Bolt threw the post hole opening with a washer or two secure it tight. Worked perfectly for me.

 

I still can't figure out why anyone would want to replace the second battery...

 

Nice first post, Martin! Welcome to the forum.

 

After having one replaced on warranty I took the universal forum advice and just discounted the ground. Haven't missed it at all.

 

I am still stuck on the reason to want the stop/start system to work in the first place. Job #1 for me on the F-Type was to disconnect it…the dealer has never mentioned it at service time.