2004 Prius, Possible Bad Battery, need input!!

None of the cells look to bad. Are most of your miles city, or highway miles?
It might be worth a try to use a grid charger on this battery. Just a thought

 

You may be in the initial stages of needing a hybrid battery repair. You might try a grid charger as mentioned above. Click on "SHOP" for details.

 

I'm hoping to buy a rid charger for my prius next week. My traction battery isn't as "perky" as it should be. Lol, but @ 231,500 I don't expect it to at its milage either.
I have been searching all over the Internet to people that have used the grid charger for the prius, trying to see if they had good results. I guess I'll just have to order one any way

 

there is an extensive grid charger thread, you may find some helpful info in it. all the best!

 

You can contact PC user ericbecky or Eric Powers and ask him any questions about it. He will shoot straight with you.

 

I would have thought there was more than just a generic P3000 code present. Usually that then points to the battery ECU for more info/codes.
Is there any way to possibly have them double check?

The blocks all look good in the snapshot you provided, but I wonder how they are they when driving/under load?
Also does the report show the delta SOC (fluctuation of state-of-charge)?

Simply checking voltage at rest is interesting and may catch some issues, but it also misses other issues.

I think you are smart to consider a hybrid battery charger balancer for ongoing preventive maintenance.

 

Hi guys. Thanks for the kind words. There are a few threads on the forum from people who have used our chargers and had great results. If the battery is imbalanced and not performing as well as it used to but not yet displaying a fault indication, or failed due to cell imbalance, then cycling and rebalancing with our charger will work great to restore the cell balance and rejuvenate the battery.

If the pack has a hard failure such as in internal short or high IR cells, then our charger cannot help with this. Unfortunately there is no way to know for sure which failure a person is experiencing without tearing down the battery. For this reason, we encourage the use of the product as preventative maintenance, to keep the battery healthy long before failure of any type occurs.

 

X2

The initial snapshot from your OBD code really doesn't tell you anything. A mini VCI setup with Techstream would be alot more helpful and you can view the battery blocks while driving (watch min/max block voltages under load, if you see one block always holding the min spot under acceleration then swinging back to the max spot when you let off the pedal, you have likely found your issue. Personally I think your time would be much better spent pulling the pack out as you mention and verifying the modules individually (both capacity and load test). Then use the grid charger later as a preventive measure to help prolong the life of your battery.

 

Unloaded voltage looks fine.

 

No, it should never go below 40%

 

US Navy, he means the delta SOC.
Not actual SOC.
For delta SOC, lower is better.