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Discussion Starter · #1 · (Edited)
The attached document describes how to replace the small auxiliary battery in the the 2020 and before model years.

If you use a Jaguar Land Rover labeled battery (or Exide EK151 equivalent) then you only need page 4 for a step-by-step instruction list.

The rest of the document is for persons who want to use a less expensive motorcycle/motorsports battery. The Jaguar Land Rover battery is expensive in the US (> $200) compared to the UK (< $100 USD for an EK151). I did this for a total cost of about $150 for parts and tax. (I actually spent > $200 as I explored alternatives for everyone.) The only thing that would cost in the future is a battery and that would be < $100.

Read through the instructions. If you plan to do this, you can be prepared by getting the parts together before your battery fails. Get the replacement battery when it does fail or could fail based on age.

Battery removal time: about 20 minutes if you haven't done it before (excludes waiting time for the car to power down)
Battery install time: about 15 minutes (gravity helps to install the battery ;) )
Assembling the motorcycle/motorsport battery change: about 1/2 hour if fully prepared

Thank you to @sciencegeek and @dernotte for proof reading and comments.
 

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The attached document describes how to replace the small auxiliary battery in the the 2020 and before model years.

If you use a Jaguar Land Rover labeled battery (or Exide EK151 equivalent) then you only need page 4 for a step-by-step instruction list.

The rest of the document is for persons who want to use a less expensive motorcycle/motorsports battery. The Jaguar Land Rover battery is expensive in the US (> $200) compared to the UK (< $100 USD for an EK151). I did this for a total cost of about $150 for parts and tax. (I actually spent > $200 as I explored alternatives for everyone.) The only thing that would cost in the future is a battery and that would be < $100.

Read through the instructions. If you plan to do this, you can be prepared by getting the parts together before your battery fails. Get the replacement battery when it does fail or could fail based on age.

Battery removal time: about 20 minutes if you haven't done it before (excludes waiting time for the car to power down)
Battery install time: about 15 minutes (gravity helps to install the battery ;) )
Assembling the motorcycle/motorsport battery change: about 1/2 hour if fully prepared

Thank you to @sciencegeek and @dernotte for proof reading and comments.
Thanks so much. My question, do we need to do any something like code resettings.
 

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Discussion Starter · #5 ·
No they don't work. I explored those as well as hard-to-find JIS posts to affix directly to the replacement battery. The JLR/EK151 battery posts are actually smaller than JIS.
 

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Discussion Starter · #7 ·
Has anyone else realized that these batteries do not appear to be available for purchase at dealer online websites in the USA
Yes and that is another reason to install an aftermarket, sealed AGM battery as I did here. It was shipped via US Postal Service to my remote location. No special carrier and delivery required.
 

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Discussion Starter · #10 ·
Not a bad idea ... one would want to monitor its SoC from time to time? Looks like they're lithium iron phosphate batteries?
Standard AGM.
 

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Discussion Starter · #11 ·
My car is a 2020 so Im thinking that I should just buy a spare and keep at home for peace of mind.
A battery just sitting around unused will go flat on its own unless kept on a low-amp battery tender.

It's life span will still be from when it was made. If you get a battery now, don't use it for 2 years for example, you've got an aged battery that will have a shorter useful life in the car. A battery that goes flat will have an even shorter life. You'll have to charge it before installing it. Some chargers won't even attempt to charge a flat battery.

If you're not at home when the car's battery fails, you've got to get home to retrieve it, get it back to the car and install it. You'd be better off carrying it in the car all the time with occasional recharging when you are home.

Just things to consider if planning to have one on stand-by.
 

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A battery just sitting around unused will go flat on its own unless kept on a low-amp battery tender.

It's life span will still be from when it was made. If you get a battery now, don't use it for 2 years for example, you've got an aged battery that will have a shorter useful life in the car. A battery that goes flat will have an even shorter life. You'll have to charge it before installing it. Some chargers won't even attempt to charge a flat battery.

If you're not at home when the car's battery fails, you've got to get home to retrieve it, get it back to the car and install it. You'd be better off carrying it in the car all the time with occasional recharging when you are home.

Just things to consider if planning to have one on stand-by.
I could put the spare in the frunk! I have a battery conditioner at home. Just might be worth it. In Maryland the dealerships are spotty.
 

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Is there no way to monitor the state of charge of the auxiliary batteries? No read-out in the car? A test that service can do? Otherwise, it seems like we're playing the battery lottery. If it fails, you're SOL.
 

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Discussion Starter · #16 ·
Is there no way to monitor the auxiliary batteries' health before one fails? No read-out in the car or test that service can do? Otherwise seems that we're all playing the battery lottery.
 

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Is there no way to monitor the state of charge of the auxiliary batteries? No read-out in the car? A test that service can do? Otherwise, it seems like we're playing the battery lottery. If it fails, you're SOL.
I had my dealer check the 12v batteries just before the warranty expired (60k miles)... they found one battery was far below spec and replaced it
 
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