12V battery group size

Maybe not.

What if you find out that the charging system doesn't have enough capacity to RE-charge the extra capacity during your normal daily drives ?? Then the pain will just be prolonged and it will just be longer between "jumping" events.

But never mind that, it sounds like your mind is already made up and you don't want to be confused with facts.

Good luck.

 

I am interested in whether we can replace the 12 volt battery other than purchasing from a dealer. You know we will need to do this eventually. I do not really want to do like the HV battery "rebuilders" and raid junkyards.

 

i've read here that people put in larger batteries, or two batteries to run an amplifier. i wonder how that works?

 

when people started needing batteries for the gen 2, there were no options until the optima came out. looks like toyota is trying to outsmart us again.
eventually, if someone has to make another odd size to make it fit, it won't be cheap.

 

My other question - how good is the standard - or a heavier duty replacement - battery at recovering from going flat. I remember back in the '50s that it didn't seem to make a huge difference, jump the car, take it for a drive and it fixed the problem.

But when I installed the 2nd battery for my fridge (late '70s) I was advised to not use a standard battery, but a deep discharge battery, which would be more forgiving after having gone flat.

Then in the late '90/2000s, some of our work cars would get a flat battery as a result of doors left ajar or headlights on overnight. We were getting more cases where a jump start would start the car, but even a good drive wouldn't charge them up, try the battery charger - often then just required a new battery - on a relatively new car.

How will the 12v PRIUS battery compare with those scenarios? I imagine it doesn't need a high cold-cranking voltage, but not sure what it's design specialises in?

 

They are an agm type battery. I believe @Mendel Leisk has a type of battery charger he prefers for this type.

 

Yes, Toyota’s Electronic Parts Catalog gives the same battery part number, 28800-37130, for all fourth-generation (ZVW5# series) Prius cars, including the Prius Prime (ZVW52), in all markets.

I’m not sure why mine is marked 28800-37140, though it also doesn’t say GS YUASA like @jdenenberg's does; perhaps Toyota assigned a new part number for a second source.

I doubt it, since there are aftermarket substitutes already available in Japan, including the GS YUASA part I mentioned earlier and the ACDelco 355LN1. There is even a standard for them, SBA S 0102, Lead-Acid Starter Batteries–European Norm Type (欧州規格形始動用鉛蓄電池), published by the Battery Association of Japan. A paper in the Furukawa Battery Technical News (PDF) explains how the standard was developed.

If I had to replace one today at my own expense and didn’t like the Toyota dealer’s specifications, price, or availability, I might look into whether the ACDelco LN1PS (88864528), which is used in the 2013–2018 Chevrolet Spark, would be suitable. It has the same dimensions as the one in the Prius (207 mm × 175 mm × 190 mm), about the same weight (12.7 kg), and slightly better specifications (375 CCA, 50 Ah₂₀); I don’t know if the terminal size is the same. Its aftermarket substitutes, like the Duralast H4-DL, might also be worth investigating.

 

Yes absolutely.
Any 12 V battery that will physically fit will "work".

Some may not work well if you go too cheap.
It really should be an AGM type and you can save a little bit getting one elsewhere but not much.

If you are thinking about putting in one costing half or less of what the dealer wants, that probably is NOT a good idea.

 

why should it be agm?

 

Because that's what it was designed to use.

AND because AGM does not vent gasses when in normal use.
AND an AGM will not be damaged (as much) by leaving it in a low state of charge.

It is just a better design overall.

 

the oem is agm?

 

Yes. As long as you have been here I would expect that you would know that already.

 

According to the manufacturer's website, yes.

 

4th gen battery is in the engine bay, not in the cabin, so none of the 3rd gen concerns, about venting, acid spillage in an accident. I've got a half-baked recollection the OEM is just regular lead-acid.

 

when they boasted about moving it to the engine bay in the walk around with danny, i figured, finally, we get a more robust, less expensive, easier to replace starter battery.

so what did we get? another crummy, expensive, lightweight agm, that is now in a different place? big whoops!
and, we are already seeing way more failures than in a gasser, i think.

 

Actually, I am not sure about AGM now. Google Translate has its limits. I think there are some other features to reduce sliiage & explosion? compared to a normal flooded lead acid batter.

We need @pilotgrrl or @Tideland Prius to translate from the manufacturer links in post 27.

I think somehow some of the battery information here should somehow make it in a sticky for future reference.

 

why would you put a more expensive battery under the hood, when lead acid has proven itself over time?

 

According to the stickers on the top, the gen 4 battery contains lead (Pb), one sticker says "do not tip" and another says "contains sulfuric acid" so the evidence pretty much points to it being a Lead Acid battery.

 

It is definitely lead-acid. I think AGM batteries are too. The manufacturer has an English MSDS sheet for sulfuric acid too.