Hybrid battery replacement options 2012 C 4

All car dealers have to sign contracts with the brands they rep, and one of the most bedrock terms is that they agree to get all the spare parts from the mothership.

If Toyota catches a dealer installing non-Toyota parts they won't have a Toyota sign out front much longer. Those are the stakes.

It's not perfect, but it is a reasonable thing you can take as peace-of-mind.

Additionally, your repair invoice will list a Toyota part number that corresponds to public catalogs listing a new replacement battery, and your new battery will be externally marked with the same part number plus a code number that can be decoded to show the date of manufacture.

 

I have never read that someone got anything but a new oem battery at a dealer except when Toyota was experimenting with rebuilds a few years ago.
But that didn’t last long

 

If you have the nexus adapter plugged in you should use it.
I can't see why you wouldn't want an initial reading to document.

You've got readings from your old pack documented, right, I'd hope anyways !
An initial reading would be invaluable IMO.
wait however long you want after that to continue your documentation.

Just my 2cents from the cheap seats.

 

q

 

Sorry. the questions you've been asking on pg 1 are not easily answered. It's a confusing time when the hybrid battery codes and the leaning process begins.
From your OP this pic show code P3000
https://attachments.priuschat.com/attachment-files/2025/02/264390_IMG_3654.png

Here is a post about a P3000 toyota diagnotic trouble code ( dtc ) at torquenews
that explains what the possibilities could be
and what the writer of the article found the issue to be in his case.
Toyota Prius P3000: Check This Before Replacing Your HV Battery | Torque News

If you understand what the possible diagnosis paths are for that code,
you might be able to find the cause of why your C is acting up.

And if it's a corroded electrical connector or connector pins
( like it was the for the author of the article ),
even if you get a new hybrid battery and don't fix the connector issue,
you most likely will get the same codes returning in due time,
maybe even right after the new hybrid battery is installed.

And it doesn't matter if it's a OEM battery installed by the dealer
( if the dealers mechanic doesn't find the issue after install ),
a green bean installed by you or some other mechanic,
or one of @jacktheripper Sodium Ion packs.
Toyota hybrid battery upgrade pack– NexPower Energy

It all depends on the skills and experience of the person that installs your new pack
to find what's actually wrong with your car.
And those can be expensive lessons learned.

Personally, I would think long and hard about available options.

If, you decide to get an OEM pack,
that is the only time I'd think about taking the older, out of warranty C to a dealers shop.
It's not like they are in business to keep older cars running and driveable.

I can see the bind you are in by the questions you've been asking,
and I'm sorry that there are no quick fixes or guarantees about the outcomes,
no matter what you decide,

unless you can narrow down the real issue with your car.

None of us posting to this thread (from what I've seen so far, anyways ) can help you take the car to the finish line, either.

But that doesn't mean we wouldn't try. So if you have questions keep posing um.

 

I don't know if there's anything electronically accessible that would tell you that the battery had been replaced, apart from the actual differences in performance, absolute & delta voltages.

On the other hand if you pop the back seat cushion up, you're extremely likely to find a new-looking battery including a sticker that shows the date code.

Here's a Priuschat thread with examples of the label and instructions for decoding them to work out the actual manufacturing date,

The bigbody Prius requires you to remove a bunch of trim before you can see this. Fortunately in the c model you only need to pop the rear seat cushion off and that's a very simple procedure: pull it up. It does take a little finagling to get the seatbelts through but it's not bad.