What can cause the Hybrid Battery Failure ?

I suspect that the rebuilder of your battery pack is the problem. It takes skill (and a little luck) to refurbish these batteries. If you plan on keeping your Prius for a long time you should consider buying a brand new pack from a stealership. Three year warranty on it and it will easily outlast rebuilts by three times or more.

 

I'm seriously just curious.
Why would you need a new hybrid computer?

If the failure was singularly with the HV battery? What evidence or need to replace the hybrid computer?

 

with reconditioned packs, it's always the pack there's no way to guarantee a long lasting product unless you use all new cells.
if there's something else wrong with your car, it wouldn't run properly, get bad mpg's and/or throw a dtc. have you checked with tech stream?

 

GeneralGump,
Can you please let us know the name of your rebuilder?

Batteries fail for various reasons.
- Mismatched capacity
- Mismatched Internal Resistance
- Mismatched self-discharge rates
- Shorted cell
- Electrolyte Leakage
- Overheating (fan failure)
- Broken voltage sensing wire
- Broken temperature sensing wire
- Corroded harness connectors
- Corroded bussbars
- Improperly tightened nuts/bolts

It's pretty amazing the batteries work as long as they do considering all the potential failure variables.
It is very hard to make a healthy pack that has long term reliability from used modules.
Too often rebuilders are learning how to do the job at your expense.

It's been interesting to watch this industry grow since its infancy over a decade ago.

 

tech stream is the toyota software you need to read trouble codes, to find if something is going on besides the hybrid battery. all the best!

 

<rant on>
The name is important because there are plenty of no-name or criagslisters who are known to provide crap packs to hybrid owners.
Can save us a lot of trouble armchair guessing at your problem if we already know that the seller is a known bad apple. (I'm looking at you Elite Auto - Elite Auto - Beware. Craigslist hybrid battery ads should make you leery | PriusChat)

Prius owners come here for free advice, it would be helpful if they also were willing to reciprocate with information they possess as well. It shouldn't be a one-way street here. Makes the forums, and the community a better place. We should all be willing to look out for our fellow owners. <rant off>

That said, there are guys like Phoenix Hybrid Batteries, that you can trust.
Listens to customers. Stands behind his products.
Hopefully that is the super secret, mystery person your are dealing with.