P0A80 advice...

Use the 6 VDC range as your point of reference. You'll have to make a judgement call on what needs to be replaced. I have a feeling your going to find at least 3 cells that will read out of line with the rest of the batteries you test in your pack. Those will have to be replaced to get rid of your P0A80.

Here's a decent explanation of how the tester works.

Good luck guys.....

 

Thank you for the tip and the video on using the HF load tester.
Yes, I have 3 bad blocks according to Toyota. Block #7 is my worst one. It was only in the 12.59-12.42 range when it was tested. Thanks again

 

Sounds like a good canidate for the Prolong system...
Or replacing all the cells....

 

It was more than $4500 installed here, if they have a battery in stock. They didn’t 2 weeks ago.
Here’s my print out. Blocks #6,7,10 are bad with #7 the worst. I’m not sure if using Prolong will help block #7. But I’m willing to try it.
I think I have to replace the 3 bad blocks to get the battery to not throw the code. Any thoughts or advice?

 

A lot depends on your funds, and how much time you have.
If money isn't a problem, get new cells from newpriusbatteries.
The Prolong system is just under $750 with tax and shipping.
If you decide to replace the 3 cells, you'll still need to "balance" the pack or you'll still get errors.
So you'll need the Prolong system. Yea yea, I know, there are "other" ways of doing it.
And it would depend on how much time and space you have....
But using the Prolong system, the battery is back together, you install the harness and then
start the system. About 2-3 days depening on how you monitor it.

If you have the time. Get the Prolong system, run it through the cycles. Then clear the codes.
And see if it brought the weak/bad cells back. As I said, it should hurt to try it. If it works, great.
You saved some time and money. If the codes come back, and you have the same problem with the
3 cells, you know what to do. And then you already have the Prolongs system to balance it out.
As I said, a lot depends on your funds, and how much time you have.

You can get new cells from newpriusbatteries for $1600. NEW....

 

I’m just learning on how to work on the hybrid battery, forced to by the P0A80 code. I wanted Toyota to confirm the bad battery modules for me. Dr Prius app only had #10 as the bad block and I’m not sure how to actually read the data.
I had planned to do exactly like you Paul, so I am waiting to see how you do. I’m probably going to do the Prolong and see how it does. Then if it doesn’t work, take out the battery and look at the individual modules and connections better.
A new battery pack from NPB is also a possibility. Not sure how much shipping would be across the pond though. I’m waiting for the holidays before I start anything.

 

While you have the cover off to install the harness, you can clean the rear bus bars.
If they are corrode. It's pretty easy to do them. The front side has the sensors.

 

I’ll probably try the Prolong first and see if the battery improves. If it doesn’t, then I will then determine if it’s worthwhile to rebuild my old battery or just get a new one from NPB. I will check all the connections, bus bars, nuts, etc. and clean them too. I’m hoping to have it last a few more years with minimal cost.

 

WHAT???? $300 shipping? That's insane! You might as well order all the cells for that cost...
There is no way it cost THAT much for shipping....

 

Thanks for the shipping quote. Where/who did you order your replacement modules from?
And please take some notes to document your procedure and progress since I’m hoping to do the same. Mahalo

 

I’m hopeful the tested similar modules will rejuvenate your hybrid battery. I have been searching eBay and had the same thoughts about quality control. Looking forward to your success!

 

Thanks for the update.
That looks like a possibly very useful application. I’ll have to check it out.
Do you know which of your blocks are bad? I would start there and look for other similar patterns, but I actually have no idea how to read those squiggly lines. All the voltages are close together. Maybe you need to check the battery when it’s more depleted or under more load. Anyway, good luck!