12 v Battery replaced on Prius + (Bosch S4 019)

Depends if the battery is an AGM or standard flooded lead acid. The factory battery is an AGM battery with a vent tube access. The primary advantage is increased deep cycle capability, meaning it will take more deep discharges than a standard lead acid battery. This adds long life and reliability. Also the AGM's battery acid is locked in a fiberglass mat making it a little safer for interior locations. It charges faster but is more expensive than a standard lead acid. A lead acid is better at short term high current requirements that a conventional car starter requires.

 

Capacity is NOT a problem, as that battery does NOT turn an actual starter motor.
And it appears to have a 4 year warranty so I wouldn't worry about it.

 

I agree. They you sold a good battery for the price of the better AGM the car was originally supplied with.

 

don't confuse prius hybrid with a start/stop where the 12v powers a starter motor.

your concern should be that the battery is inside the cabin, and needs to vent to the exterior.

a toyota dealershould not be selling/installing batteries that don't.

as far as price goes, an oem is over $200. here, and installation at a dealer can be up to another $200.

 

Once you are in Ready, the 12v is continuously coming from the inverter's dc to dc converter which is taking a portion of the hv batteries 201vdc and regulating it into the nominal 12v. Regardless of the gas engine's running state.

While the car is in Ready mode, the 12v aux battery is essentially being charged by the inverter so that it is capable of providing power for the next Off to Ready cycle that you initiate. One could argue it is being used as a ballast to ensure smooth 12v power and might supply current in certain momentary high amp draw situations such as electric heat combined with power steering while being abused by some Canadian's 1500w inverter.

An AGM battery can take a higher charging voltage than a flooded lead acid battery. I would rather have the AGM as it is a better, longer life battery. Assuming you current battery is not AGM.

 

This.
But......you are more likely to have a piano fall out of a UFO and land right on your head than you are to have any problem created due to not having a battery with a vent hose.

 

i think you are still confused.
prius does not use the 12v battery to start the engine. it is there to boot up the computers and close the relay to the hybrid battery.
the hybrid battery is much larger, more important and more expensive than the 12v battery.
imoves the car when the engine isn't running, and starts the engine in the (as you put it) start/stop feature.
once the 12v has fired up the computers, it is no longer necessary, until the next time you press the start button.
the hybrid battery, along with the engine and inverter/converter take care of everything.

if the bosch is vented, you are good to go.

do a little research on hybrid battery, it will be enlightening. or better yet, there are lots of youtubes on how prius works.

 

And that statement just proves that YOU are more than a bit confused too.
While it is theoretically possible that it is true, it is highly unlikely.
And it is a proven fact that you aren't qualified to make statements like that about how electronic systems are engineered.

 

thanks sam, i love you too.

 

actually, bisco describes perfectly how the hybrid system operates

 

Except for the part about a 12 V battery not being needed once the system is "started".
With many/most/all modern computer controlled vehicles, they will not run right.......or at all.......if the 12 V battery is missing or completely dead.

 

I am voting with @bisco and @jackmilas.

The 12 volt battery doesn't really do anything, once the Ready Light is on. Its sole purpose in its lonely life is to help the computers boot the Hybrid system. I don't think that is the same thing as saying it is OK to remove the 12 volt battery at any arbitrary time, but what @bisco said is correct.

That is why the "Start Stop" rating doesn't matter. The 12volt battery does not re-start the engine when you put your foot on the gas at traffic lights.

 

This is not an election.
The 12 V battery still provides a load and a filter for the charging system, no matter what design the system has.
With some systems, the "regulator" circuitry needs to see a battery in place or it shuts down.......or has a fit.

I do not know if the various Prius models work that way or not.

 

@Sam Spade You are overthinking this, and in the process being rather rude. I don't think rudeness has a place in this forum; we are here to help people.

@bisco has not suggested that one could run the Prius without a 12 volt battery installed. He is only suggesting that the 12 volt battery is "not needed" when the ready light is on. The voting consensus is interpreting @bisco's "not needed" as meaning: "does not provide a meaningful amount of current".

@rjparker made the point that the 12 volt battery might need to to be there to act as "ballast" to make a 12 volt charging system happy. That would definitely be true in a traditional charging system. Ballast implies very little current is going in or out of the battery. But the 12 volt charging system in a Prius does not have a traditional Alternator, Voltage Regulator, or starter, so I am not convinced the "ballast" function is that important. I am not going to remove my 12 volt battery to check it out.

The primary purpose of the 12 volt battery in a Prius is to be there when the computer and inverter start up, and for the dome and body lights to work when the Ready Light is off. This is not obvious because the ICE is constantly is starting and stopping while the ready light is on. The traction battery and the inverter take care of that power (which is the point @bisco was clarifying when replying to @ginnupotter).

It is easy to get confused because some modern non-hybrid cars that turn off their ICE's at stoplights, and start again when the driver touches the gas pedal. Those vehicles require the 12 volt battery to do substantial work to restart the ICE while the key is on. @ginnupotter may have been subject to this common confusion when looking at 12 volt batteries.

In the context of @ginnupotter's post, @bisco is still not confused. My vote stands.

 

Just editorial: it's presumably @sam spade 2 you meant to address.

 

yeah, not sure sam spade 1 or 2 is getting the message

 

You are Correct, I missed that "2" at the end. My apologies to the @Sam Spade.

In my early internet experience, I wanted to use the username "Gromit" everywhere. It is a reference "Wallace and Gromit", a series of claymation short movies by Nick Park in the early 90s. I am more like the absent minded tinkerer "Wallace", than his obviously smarter dog, Gromit. Anyway, Gromit, and Gromit2 were always taken as usernames, so I settled on GromitToo. 20 years later, and I still am able to get that username anywhere I need it. Just a suggestion for those who hate usernames ending with numbers.