2010 Prius

Those are pretty good looking numbers and can see why you'd be skeptical... What kind of 12v? What kind of meter?

 

If you have concerns and want reliability then just replace the battery.

Otherwise, if it's less than 4 years old, charge it, load test it, (maybe test key off draw for the car). Then decide if you want to replace it anyway.

Posted via the PriusChat mobile app.

 

What are you using, some sort of electronic load tester? 225 CCA is not good. Typically a healthy battery will read well above the rated CCA.

What's the volts, when it's sat overnight?

 

I don't see how those can be remotely meaningful numbers. To confirm or measure a battery's ah rating, you have to drain it from fully charged down to a low voltage at a controlled rate at a controlled temperature. CCA stands for Cold Cranking Amperes, which is measured by definition at 0°F. CCA is irrelevant to booting up a Prius, which requires much less than 225 amperes, anyway.

 

The electronic load testers manage to test voltage and CCA, with the push of a button, and give a verdict. With my Solar BA5 the verdicts are Good, Good-but-Needs-Charging and Fail.

A typical new battery, say rated at 325 CCA, will show maybe 350~400 CCA on these testers when in good condition. An ailing battery will have CCA below spec, and the verdict will typically be Fail.

If you look on Amazon the current itteration of the Solar tester is BA9 I think. "Solar" is just the brand name, btw: it's not solar powered or whatever.

 

Toyota doesn't "getaway with it". A person chooses to have them do it, for whatever
price it is. They do not force anyone to get the work done.
Just Say No!

 

Check the CCA on the new one. IIRC they’re rated 325, and I’d wager you’ll see around 350, or more.