HV battery issues - ideas please

Oh boy, where to start.

The traction battery cells are 1.2VDC each - not 14.1. There are 168 NiMH cells in the 05 Prius assembled in 28 modules containing 6 cells in each module. The module voltage is 7.2VDC.

What diagnostic trouble codes (DTC) were stored when they inspected your car? Did the stealership even bother to tell you what they were? They should have been listed on the work order you signed and paid for.

If not, call them and ask for any/all DTCs they found and lettuce know what they are.

 

You might want to consider if your regular 12v battery is in good condition. I am not a HV batt expert, but it is true that one bad module can bring down your Hv batt. Although it is theoretically possible to fix the one bad module, it is a lot of work to rebalance all of the cells, so normally, not done. If HV repalcement is deemed necessary, you could replace with a reconditioned batt, salvage batt or new Toyota batt, the latter being the most expensive option. Even a good quality reconditioned batt (Re-Involt.com) is probably going to run you $2000. Good luck.

 

$2800. from a dealer is a pretty good price. how many miles on her?

 

If the warning lights have disappeared and not come back, their is a possibility that this was a temporary condition. If this were me, I would drive it and wait for the warning lights/DTC's to come back (consistently).

 

They are talking about block voltages (14 blocks per HV Battery)
The battery ECU, which monitors two modules as a single battery block, detects the battery block voltage
at a total of 14 locations.

 

I second wjtracy's comment to check the 12V battery. If it's bad, all sorts of strange codes can be stored. The HV battery probably does have a bad cell, but that's a big hit to take before making sure that the 12V isn't the problem. I think it's about $2000 for a Reinvolt refurbished battery installed.