I want to alert everyone of an issue with the auxiliary 12 volts battery in the new Prius prime 2024

If the dealership won’t do it, maybe check the amperage draw on the battery, when the cars been off for at least 1/2 hour, with fobs well away. It shouldn’t be much more than 20 milliamperes.

 

The check mark boxes come pre checked from the factory

 

I, too, got washer fluid warnings as soon as I drove out of the dealership. Finally just bought a gallon of washer fluid (it needed the entire gallon). [My nearest dealer is 1.5 hours away.] Clearly not filled at factory or delivering dealer.

 

Our temp spare was at 40 psi when we bought our '10, new. Also, the 12 volt battery was dead-as-a-doornail: they discovered that alright, and did their level best to hide it, had it "running to warm it up", when we showed up for a test drive.

That's Open Road Toyota in Port Moody; always like to give them a plug.

 

"Bricked"?? That means beyond repair—dead as a brick.

So, the car was roaring when you braked because you had a defective 12-V battery?

 

Our 2023 was delivered without wiper fluid too lol....neither did it come with a plastic dipstick for it whereas my GR Corolla which was delivered a couple weeks after had both wiper fluid and the plastic dipstick..idgi

 

Easy enough to run a pigtail out the hatch for a quick connect battery maintainer, but that should not be necessary unless you drive infrequently, or only do very short trips

 

Cars can go into a default mode when some warning messages are on, or simply not run right. Which could cause the noise.

Does the Corolla have a warning light for low windshield washer fluid level?

 

I'm not sure, I'll have to look in the GRolla manual, maybe it is like any other Corolla so perhaps not is my guess..but it would be weird since the 5th gen Prius, which albeit new, is built on the same general global platform so that seems odd to have such a difference between the two.

 

Not so great they say keep a battery maintainer on the car. It isn’t unique to Toyota to get discharged batteries on hybrids or evs.

I see they sell battery monitors with a hall effect sensor so the charging amps also can be read. Don’t need to rig a shunt in the battery cable.

 

Our '10 is almost invariably on a charger, but our situation is very low usage, often just once a week or so. They tend to be good runs though; I think that keeps the engine and hybrid battery happy.

 

They share the underpinings and frame parts. The fluid tanks are made to fit the space available of the specific model.

None of my previous cars(Ford, GM, Toyota) had a dip stick nor low level sensor. It was just add fluid until I saw liquid.

 

Our 2011 Prius, my 2 previously owned FRS and now our GRolla all have the dipstick but yea our 2004 RAV4 has a very visible tank so you can easily tell how much is in there.

 

Can’t we leave their body parts alone already?

 

Your 2024 Prime XSE Premium comes with a Lithium 12V battery? Can you snap a picture of the thing as I'm curious to see if they have indeed changed a thing or two...

 

Separate from mis-applying the term "brick" ...

Is that factory 12V battery really lithium, not lead-acid? Or did you put in an aftermarket 12V?

 

Regardless of the op’s mistaken terminology or 12v identification, he makes a valid point about the prime 12 volt problems which have been discussed in several threads, and which every owner should be aware so they aren’t stranded unnecessarily

 

I mounted my battery maintainer under the hood. The fuse box with the booster contact, has a lug near it with a 10 mm nut on it. Connect the ring terminal of the maintainer to that, and to ground. You can run the power cord out like a block heater cord.
I've had this setup for several months now, and it worked well until the time my battery went dead in less than 2 hours when I was nowhere near a plug in. Obviously, there are bigger issues, and I'm getting them checked out today.