Replaced 2004 HV battery with a 2010 salvage one

Updating HV Battery ; I installed a 2010 salvage HV battery in my well used 293k mail route 04 Prius. See pic's in profile of my dirt covered battery I have to clean yearly, I drive with the window down delivering mail , no a/c cooling until the end of the day for my battery.

High mileage 04 battery at 9 years , still functions, lower capacity showed by the '6 bar drop ' test at 3:15 & 3:44 min/sec (Others had up to 10 minutes)* . MPG still around 40 with maybe a slight hesitation when the gas engine engages, no real drivability problems felt , driving moderately in fairly flat Kansas.

I had read that the newer 2010 HV battery has increased power rating, that plus the age and mileage of my battery motivated me to buy a salvage battery on Ebay for $750 with free shipping from a low mileage donor car. I received the entire battery assembly, which of course does not match the second gen prius, I removed the HV modules (28) which did matched my modules in size and mounting. Installation is more work with a 2010 since the modules have to be switched out, but I do have a well running pack, the '6bar drop' test got time results of 13:44 and 12:25 (second at higher temperature, rear fan was running).

Driving.... I surprisingly really do not feel a difference, perhaps a bit smoother, but since I don't run it hard and have no long inclines, I really don't push the battery to the extremes. MPG still around 40, includes delivering mail . The battery indicator screen does stay more in the 6 bar range than vary like the older one did, also the measured scangauge temperature seems around 5 degrees lower on the 2010 HV battery pack when driving all day. I did test the old battery for amperage, flooring the pedal I got a scangauge high of 144 amps (BTa) for both the older and the 2010 pack. I did buy some peace of mind, changed the pack when it was convenient on my terms, not due the battery quitting.

Old modules are still holding voltage fairly well and evenly dropping from 7.9 to 7.8 volts over several weeks. I had a 2004 module tested, the Battery guy said it had 3 amps.

* Hybrid (HV) battery test proposed | PriusChat

 

I had warning lights at first because I didn't click in a wiring harness in the 2004 HV ECU unit that I had disconnected, that was just my oversight, a few start up /shut down cycles then cleared the lights, driving it works well.