Prius hybrid system ECU powered up with 12v battery and gasoline starts with MG1 (hybrid battery). Why higt CCA-rating 12v Battery is used there in Prius. A high CCA-rating battery is required to start a gasoline engine in non-hybrid cars.
we use the oem, or compatible. you don't need high cca, just get a similar spec. most important is physical size fitment.
Actually the question is - Why did Toyota design Prius with high CCA-rated (e.g, 360A) auxiliary 12v Battery instead of deep cycle battery?
I guess it is just marketing for sales. It isn’t required as it isn’t cranking anything as you stated. Maybe the same size is used in other non hybrid cars. Maybe people got used to cca to compare batteries now instead of amp hours capacity. When cca started being advertised some people questioned why.
I thought maybe I was the only one who missed it. But then I don’t consider the 12v in my’22 to be a high CCA battery either.
The person Shoeb asked “why.” Looking at OReillys website for my 2020 Prime, all three choices have a cca rating listed first. That’s why they asked I suspect, not just OReillys but others they may have looked at. It’s called trying to understand someone else's viewpoint. That’s why I was able to guess some reasons while two others couldn’t. Any more clarity needed as to if it was a question or not? When someone asks why, I try not to dismiss them, especially if it was just a simple well intentioned question, not an agenda driven question.
I don’t pretend to know their exact reasoning, however deep cycle batteries are designed for a slower rate of discharge than automotive batteries. Additionally they typically have thicker plates, resulting in more weight. With the relatively small draw on the Prius 12v battery (under normal circumstances), it would be difficult to justify the added weight. EDIT: BTW, thanks for clarifying your question, I appreciate it.
I apologize for missing the question. I also have a tendency to resent when someone assumes to know my motives. I appreciate the OP’s clarification of the question (which, ironically, was not what you apparently assumed it was (based on your comment)). FWIW the battery in my ‘22 is rated at 291 CCA which is not very high. But then I am used to 650 to 850 CCA batteries.
My guess: It is all about cost and availability. If you use an "off the shelf" part (battery), it likely is to be less expensive that one of lesser capacity and size that must be made just for one (or a few) models. Anything of unique design has a higher unit cost, usually. So......I am assuming that the next step down in "standard" batteries would be too much of a drop. AND there is no reason to expect that any "deep cycles" would be encountered in "normal" use. But way, WAY too many people waste WAY too much of their time and energy worrying about why the maker of anything did it exactly the way that they DID.
I don’t like arguing on the net and wasn’t happy about my comment. I did say I suspect what they meant. I thought it was correct. Cca wasn’t used years ago if I remember right. None of it really matters and I ask myself why am I even talking about such a thing? I don’t have the original battery in my 2020 Prime. The non Toyota new car dealer put an Oreilly battery in. So I don know if the original states cca on it or not. Maybe it is a deep cycle battery.
Btw, One can get a Toyota TrueStart battery from the dealer online and pick it up. It’s less than the Oreilly etc and has a better warranty and is the correct kind, whatever kind it is. In my area anyway it’s cheaper.