I just got a Prius! (And now I have to work on it!)

yes the discharge/recharge does bring back somewhat a dead battery , however, if any cells within a module have reversed polarity ,
its an excercise in futility - u can determine this by seeing live-time coverage of block status with the torque app - a quick call to an expert on this like user 'eric-becky' will help set u up*maybe even a utube video on this * - you get the dongle , u get the app (android only), u get wifi or blue tooth connecting, then you have to add a voltage block widget, yes one for every block (, it is tedious, but seeing the voltage in real time lets u understand a bad block, perhaps a bad communications connector or corrroded block connector/harness ...

 

Hybrid Automotive themselves say you can use their system before you get the code. You will likely need to replace one or more modules but they sell used ones too.

 

This behavior is the car trying to protect itself and give the driver enough emergency power to navigate to the a safe place to stop. Basically stop driving this vehicle till it gets fixed.

There are two types of gen2 owners: those that have replaced the HV battery and those that will. You have a failed HV battery (it keeps telling you that). The modules in that 06 are now 15 years old.

The next questions are how reliable do you need the repair to be, the length of time it needs to work/reliable, and the costs (direct and indirect) required to meet those requirements. One needs to account for the indirect costs of failures/downtime: safety while driving, missing work, not having transportation, trips, etc.

Your options from least to most in terms of costs and reliability (funny how that works):

1) Do nothing and sell the car (like the PO did)
2) DIY repair the failed modules (wack-a-mole)
3) Grid charging the old pack (too late for an 06 IMO)
4) Buy a cheap local rebuilt battery (often marketed as "new")
5) DIY repair + grid charging
5.1) Buy/find a good used OEM battery
6) Buy a national rebuilt battery (often marketed as "new")
7) Buy ALL new aftermarket (Chinese) modules (cells), DIY install (owner responsible for old pack)
8) Buy a new OEM battery (DIY install and return old pack to Toyota for $1350 core charge refund)
9) Buy a new OEM battery (dealer does everything)

GOOD LUCK!

 

You missed one option. Buy a used battery from a low mileage junked Prius.

 

Good point! Those packs ( gen2's) can be so rare nowadays that I forgot about that option. Added.

 

Modules from a Gen 3 pack will work or from a NiMH Gen 4. Trim Two and, I think, Trim One

 

Yeah, I thought about those too but decided not to go down that rabbit hole.......

For example:

 

I do not know. I know the experts here and others have used the Gen 4 NiMH modules in a Gen 2. The Gen 4 modules are claimed to use a higher quality Nickel

 

Be aware that with ordering Gen 3 modules you might end up with modules that are much better than the 14-year-old modules that will remain after you do a swap. Having a much better module will only cause you problems. When the guys are talking about using Gen 3 and Gen 4 modules up-post, they are talking about replacing all the modules from the new pack into the old case.

Looking at the table you quoted above:

You rightly point out a problem with block 11. One of the modules has a failed cell and needs to be replaced. Replace the module with another of like capacity, balance the battery and you are good to go.

 

Like I said that is the hard part. eBay is one way but very hit and miss IMHO. Once you have them you would need to test them yourself (charge/discharge/charge/load test) to evaluate whether they are good enough. You might be better to try @ericbecky or Hybrid Automotive. At least they will care enough to not sell you trash. They will likely not be the cheapest, but they will be better quality when compared to random eBay sellers.

 

i've been down this road as have many others,
you will get some time out of the cell replacement, -- but it wont last too long ... like if u get more than 3 months
that will be surprising - you're never gonna get a module of the same age, use , chemistry ,etc of the originals u are attempting to match up with ... but play whack a mole and do your dues ... get your temp fix in and monitor your voltages with TORQUE ..
look at the temp too ... i think there are 3 temp sensors on the hybrid bat , u should be able to get at least one hybrid bat temp on torque
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