One last HV battery question before I let my Prius die....

Excellent work with the 2 min load test. However, you might need to also do the 3-5 times charge/discharge cycle to identify modules with low capacity. There are some more things like balancing etc. Probably you have seen here posts like the one below:
Prius High Voltage Battery Reconditioning | PriusChat

 

Maybe this is what you ran into...the Lebron James explanation....

Inconsistent Hybrid battery readings | PriusChat

 

Maybe just sell it to someone who wants to spend time fixing it.

 

Maybe it is a good idea to fix the car and keep it. Here, the resale value is around $3300 and not ready for scrap yet. Note that used car prices went up by 25% due to supply chain issues. A used Prius will continue to be more valuable than other used cars as gas prices remain high.

Now back to the hybrid battery. You have completed step 1 to check for lower module voltage by about 1.2v and identify a bad module with a single burn cell. You have completed step 2 to load test each battery module and identify modules that can not hold charge like the rest. You can do step 3 using hobby chargers to charge discharge the modules 3-5 times and identify modules that have low capacity. And step 4 to do the same for the replacement modules. Last step is to get each module at identical voltage with the rest and connect in parallel and let all modules equalize for a day before you do final connections and install it.

Even if all the steps are completed correctly, the battery package is still 17 years old. The possibility of another module failing in the next 2 months or 2 years is now rather high. Another more costly approach is to buy an OEM Toyota battery G951047031 for around $1550-$1700 depending on dealer discount and install it DIY but this option makes sense only if you plan to keep the car more than 4-5 years.

 

Even if you have all "good" modules, that doesn't mean that they all have the same capacity anymore. I did LOTS of reading here on the forums when I bought my Gen2 with a failed HV battery. Ended up getting 4 hobby chargers and 5 ebay modules. Took about 5 weeks here and there to cycle all the modules (3-6 times each) until all measured 5500-6000 mAh.

Knock on wood, still working well (0.2-.3V difference) after 17k. When it goes, I'll probably get a new pack.

Posted via the PriusChat mobile app.

 

there are many threads here on pack replacement. you can shop around for an oem, as far as you are willing to drive, and compare to the new modules from 'newpriusbatteries' and dr. prius lithium modules.

on the oem, you do swap a lot of stuff over.

 

Nothing like the tested OEM battery. I see one dealer in your area selling for around $1699. You need to check different dealer prices with
Toyota Parts and Accessories - Official Online Store


https://parts.tustintoyota.com/productdetails.aspx?makeName=toyota&modelYear=2004&modelName=prius-hatchback&stockNumber=g951047031&ukey_product=63533084&referer=parts.toyota.com&machineIDT1=l43tbi0jsb45kdz1dtr4qqxu

I asked my local dealer last week and he said there is absolutely no issue selling me the OEM hybrid battery as retail. The price was $1535 online. Note that they need to keep a core deposit which eventually would be returned.

 

Man I wish I could get that price here, if I drive 75 miles I can find it for $1699, if I drive 30 miles and cross 1 toll bridge $1755, or any actual local store (<20 minutes) full MSRP at $1950

 

Is 75 miles too far to drive?

 

Good question.

Up here, just north of the 49th parallel, there's "post box" services, in small towns just south of the border. Sometimes US retailers flat-out won't ship to Canada, or if they do it's with onerous shipping charges. So these post box services have a viable business model: if you're prepared to drive down (to Blaine in my case), and contend with possible duty charges at the border as well. I think with the latter you get waved through as often as not.

 

75 miles from SF doesn’t sound like a trip to the moon to me. In a Prius that’s 3 gallons of gasoline round trip. Even in California that’s only $15.

 

Old is old. Getting it to run again with a better used module just means you have another mix of used modules which do have an end of life close to each other.

My understanding is you move some of your electronics to the new assy.

 

I just bought an OEM pack just beware for the 1699 you are only getting the battery rack and cover the front end of the battery with the computer and whatnot is not there you have to keep your old one I had to take mine off at the dealer because they swore up and down the battery was complete if I can attach the pictures I will so at the dealer I took the front end of my battery off which houses the connection to the car the relays the battery computer and I think that's about it the new battery comes with the harness that goes to the plug or goes to the fuse and shut off the big orange plug all the other wiring is already on the battery you're only going to apply the plug harness for the removal of the battery I hope the pictures will post

SM-A715F ?

 

Duh the photo. Luckily the parts guy at this dealership was very unknowledgeable I basically took a whole bunch of parts off the battery He didn't care do whatever and so I did

SM-A715F ?

 

Congratulations! Excellent choice and price.

Please let us know what exactly needed from the old battery when you install it. Based on your description and photo I assume we will need to transfer:

1. Upper battery carrier (computer case)
2. Battery ECU
3. No 1, 2 and 3 system main relays and wiring
4. Main resistor
5. Current sensor
6. Orange plug ( service plug with orange wires is from new battery)
7. Plastic terminal covers
8. Junction terminal
9. Mounting screws and nuts

Is anything else needed?

 

Old reply, I apologize as I largely ignored the car for well for a long while.

But 75 miles isn't a trip to the moon, but 1) I don't feel comfortable driving the Prius at freeway speeds with the HV battery acting as wonky as it is, 2) The other transport option is roughly 6 gallons of gas, and the argument there is I'd be saving at most like $20 for having to go that much further and 3) Even if I did drive the Prius it hasn't gotten 50MPG for a LONG time.