Reconditioning my Gen 2 battery and all cells have low capacity

What is your charging setup?

 

Age, Heat and time are all factors that reduce the life of the OEM NIMH batteries. 2024 is about correct timewise for an 2008 OEM battery to start dying.It sounds like you are doing everything correctly.Not sure what your rate of charge is but slow is key slow up and slow down. If you plan on keeping the car for 5 more years. I would side hustle with Amazon Flex or Grub Hub make $2,000 and buy a New Battery. This might not be an option for you. But those are low miles and a new battery will give you value both if you keep it or sell the car down the road.

 

Maybe now that you've seen a little bit about how this works and you're tearing into things and seeing more of how things work and get corroded and and so on and so forth is Prius really the car that you really need to make a big deal out of? You could be in the Yaris and get 5 mi to the gallon less gas mileage approximately that will take a long time to add up to the price of a battery the price of the coolant pumps and replacement parts that go on these cars so on and so forth. So unless you are packing on the miles making serious money doing Amazon flex and hauling old folks their food then maybe maybe and only a slight maybe is the Prius possibly right for your situation. Or you enjoy spending time rebuilding batteries and playing games and whack-a-mole and so on because you have plenty of time with the way work is going today you're not making your money off this kind of work it's just for enjoyment or I can't even imagine what. People with real jobs that have to go and have to perform generally wouldn't have time for Prius antics and games for the most part unless they making really good money at their job and they can just hand it to somebody and pay $3,000 back and have it handed back and they have a spare car when the Prius messes up so somebody who's sitting with an old Yaris and an old Prius they pretty much have it figured out and relatively cheaply too you can own an old Prius and an old Yaris for three payments of whatever you might be paying on or it is possible We do it here quite a bit.

 

You've got to be thinking to yourself or out loud a generation two or what have you Prius sitting 2 years unused out in the San Diego weather if that's the case what are you going to have after you recondition the battery and what might it be worth and there's always these things You can do a lot of things and still not have a lot of car left to sell just because of the age itself so there's always that people get to seeing dollar signs with an old car now because they're double what they used to cost so several years ago say 10 I used to buy these cars for $500 now people want 4,000 for them then again many don't get sold and I don't really know what happens to those nobody ever post what really happens they just say they want $6,000 and then they vanish many of these cars don't get sold or they get sold for less than half of what's asked or even less

 

I in the same boat with a 2008 currently and thinking about just doing the $1950.00 new batteries from Toyota at least they are new, and have a one warranty if I install 3yr if they do (I can't afford their labor rates).

 

Apparently this is the case when the RC charger is useless. A grid charger is needed to restore the capacity in this battery, but this will most likely last for 2 years.

 

It could be happening due to the same exact reason as here:

Capacity gone? | PriusChat

 

Hopefully the changes work. The issue is likely the length of time the vehicle sat with a fully depleted battery. Definitely use good 18 gauge cables and try cycling down to 5 volts with a 0.5A discharge and a slower 1 amp charge.

The last battery I restored/rebuilt: 2005 with 207,000 miles. I bought it for $1,500 with a failed hybrid battery. Was not left to sit for any amount of time.

3A charge to 7500mAh.
2A discharge to 6.0 volts.

Wound up replacing 3 modules with eBay units. (I chose to replace #7 in addition to the highlighted ones.)

 

You can try to keep cycling, but it may or may not result in much improvement. How much time do you have to work on the pack? Personally I'd just ensure that every module was cycled atleast 3 times and then sort the modules from best to worst. Then obtain about 5 to10 used modules and test them yourself, ensuring they are better than any of the ones you will remove from the pack.