New owner of a 2007 Prius

Hey Krust,
I have a 2006 Prius that my friend gave me and my HV battery had similar issues. I have opened and successfully change out individual cells on this 14 module battery back more than once; with amazing results.
From the looks of that picture, module 12 is obviously a bad module. It shouldn't be lagging so far behind
In my eyes you have two choices.
1. Pay between 1500 to 3500 ( I'm guessing ) and get a new HV battery and be done with it. Probably last 3 to 5 years for a used one.
2. Open up YouTube and learn how to change out an individual bad cell of your battery for about 20$. This method is EXTREMELY rewarding and time consuming BUT you will learn so much and never ever ever worry if your HV battery goes bad again cause you will know exactly what to do. It's very doable if you have a good amount of time. I can do this job from start to finish in like 2 hours. First time took me a couple days because I moved very slowly and made sure I wasn't messing anything up or shocking myself. Your car has 28 cells that make up 14 modules. One or more of your cells are getting weak. It only takes one of the cells to go bad and the entire battery is going to perform like nice person. Think of it like a chain. A link breaks and it's no longer a battery.

All you gotta do is change out that link. Good luck. What party of California are you from. I am also in Cali.

 

if you want to keep it 10+ years, might as well go ahead and fix everything.

check around with toyota dealers you'd be willing to drive to. some are as low as $1700. for a new pack.

service manual at techinfo.toyota.com

all the best!

 

Why are remanufactured batteries so bad? | PriusChat

They stopped punching out G2s over 10 years ago.....which means that they stopped manufacturing the G2 battery packs not long after....so I would lean away from going to the dealership with a bad pack.

If this car is going to be a daily driver and you only want to do it once, then you're going to have to put NEW cells in your old pack or get a re-manufactured pack with new cells.
OEM is "new" but what is the shelf-life of NiMH cells?
Toyota (is SUPPOSED TO) guarantee their replacement hybrid batteries for 3y/36m.
If your daily drive to work is above average then that three year warranty on the dealer battery might not be much longer than the re-manned average, BUT....as much as I like to heave HATE on Toyota dealers, they at least DO tend to honor their warranties if you call them out on it.

Most of the Indies lean towards a 2y average warranty - some with no mileage cap.
Some of these are really good folks while others are just hoping you get to the other side of their warranty before their pack fails.
Caveat Emptor!

I'm an ET (Electronics Tech) by trade and I'm not afraid to do a lift and lay with a Toyota battery pack, BUT.....I'd be just as stranded as anybody else if the battery pack failed while I was out of the barn.....so MY approach would be to rebuild the pack myself.
HOWEVER (comma!) I have spare cars....time....electrical knowledge...etc...which makes me a little LESS LIKELY to rebuild the pack successfully as somebody who KNOWS that they don't know exactly how to rebuild a G2 hybrid battery back.

I have no experience with actually performing this task but in the interest of being interested in project Priuses....I've seen several of the more popular vids and I have no doubt that the average person can EASILY DIY this themselves in one afternoon.

So....
Your call.
@2k1Toaster is a forum member and @ericbecky is also in the biz.
They can give guidance, advice, etc..

Regrets if I've forgotten somebody else.....

Good Luck!

 

Anyone buying a used G2 at who knows what mileage becasue posters refuse to post there mileage on this site I would bet the house its going to need a new hybrid battery asap. Its the #1 reason people get rid of that car or its a huge oil eater thanks to crappy maintenance
or dealer only oil changes.Nobody and I mean nobody opens there hood anymore. Like its a magic carpet ride. Nothing to see under there please move along.

That's all we see now is hybrid battery issues. From the just bought.

 

All of the HV batteries being sold by the dealer have decodable date codes, nothing "old" is being stocked or sold.

@PriusFruit recently performed a new OEM swap by himself, as he couldn't wait for the longer delivery dates on the cylindrical cells.

There could still be some affordable new over the counter OEM options locally (under 2k), or get on the 2kT list now and wait, or a DIY fix?

With only 130k on the vehicle do you think the HV battery has ever been touched before?

 

My battery gave out 2 weeks ago. But after looking at it with we noticed it was just one bad cell/module.

If I was you, I would look at my options and see which one works best for me. Do I want reliability? Do I want affordability? Etc.

Here's my post of the things I learned from the DIY project and some tools other members shared with me.