Red Triangle, P0a80 (2005 Gen 2, 110k miles)

At 12 years old+, it is likely to be the main HV battery. You can reset the error codes and it will drive ok for a while, but eventually you will get more codes.

You can test the 12v battery this way.
Weird stuff happening? MPGs dropping? Test The Battery | PriusChat

 

sounds as close to definite as you can get. check the 12v for funsies, but be prepared for a new battery. check out @2k1Toaster 's battery thread, he has a good option. all the best!

 

New battery at dealer around $3000+, rebuilt battery $500 to $1500.

 

There is a member here @2k1Toaster who is selling a battery kit for $1600 that is a third party alternative to buying a new battery from a dealer.

 

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The low initial reading indicates the 12v battery is failing. If you plan on keeping the car, you will need to replace it soon. When it actually fails, you will usually get a whole lot more codes and the car may have trouble starting.

However, the fact that you are only getting a P0a80 is leading towards the traction battery being the culprit.

If you drive the car long enough, a failing traction battery will provide another code(s) with the format P30XX identifying the bad modules. You will find he performance decrease, limp mode, etc.

Best bet would be to reset the codes and see what happens.

I have seen in SoCal rebuilt batteries for $500, but they have very little warranty. The best rebuilt batteries may get you 3 years of life, but the used battery stock is getting older and older and this is now the exception. If you plan on keeping the car long term, you should get a new one.

 

A rebuilt battery is just a used failed battery with bad modules replaced with ones from another used battery. Even if it is properly serviced and balanced it will be an unknown, possibly short time before it fails again. A warranty is good but that means more downtime while the car is repaired again.

 

I bought a rebuilt battery for my second generation and the Hybrid battery has been refurbished with 3rd Generation cells. 3 years of unlimited miles parts and labor warranty. He was well worth what I paid to have three years of trouble-free service and I can sit there and watch the guy replace it in less than an hour

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Run AWAY!
Seriously, you could get a battery kit of new cells from @2k1Toaster .
A "remanufactured" or "rebuilt" battery is just a used failed battery that has had some modules replaced with used ones and balanced & tested. t could fail any time - 1 week, 1 month, 1 year, 1.5 years.Those first ones would mean more downtime for warranty replacement. The last one would mean having to buy another battery again.Some remanufactured battery warranties just cover parts.

For a new $1600 ($1500 special now) kit see Prius Battery Replacement Kit (GenII/GenIII) with NEW custom cells | PriusChat

 

Check and make sure that they offer a full warranty for 6 years and not a pro rated warranty

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So I went to their website and from what I gather (in the 5 minutes spent there) is that a 5 year warranty on a Gen2 battery will run $2749. Somehow they have higher “tiers” along with the higher warranty.

If it were me I would consider the following:

• Current mileage, cars condition and length of time you plan on keeping the car
• Call Hybrid Pit or Avi’s Automotive and see if they would quote an install of 2k’s setup
• Price compare
• Get the fine print from Elecyron Automotive to understand what is in the warranty
• Determine if you are ok with the time commitment required if you go down the Electron Automotive’s rebuilt battery.

Good luck .

 

If you're going to spend over $2000, you should just get new from Toyota. The warranty shouldn't be your main focus here, a new battery with 1 year warranty will typically last 10 years. However a rebuilt with 6 years warranty can have multiple replacements during that time.

A good example is with Dorman rebuilds that offer 3 years warranty, their products have been known to fail multiple times, right when you need the car most. It doesn't mean 3 years of trouble free driving.

Your car is nearing 13 years old, you should expect other expensive things to fail on the car so probably not good to think 6 years out.

With the lower mileage on your car, your best option is probably to fix your existing battery. Don't give up that battery for another rebuild that can have 300000+ miles on it.

 

Most likely scenario is that your battery has 1 or 2 bad modules, the rest should be pretty good since the car's mileage is not all that high and hasn't been cycled that many times. All you would need is to get good tested modules to replace the bad ones.

You can buy the equipment to maintain that battery from hybrid automotive for $700 to $800. This equipment will charge and balance your battery pack. You can do this two or three times a year in your own garage.

 

interesting website, are you going to install it yourself? and remove it and reinstall it every time it fails under warranty?
if that's the case, i would search long and hard for the cheapest new toyota battery i could find.
one and done.