@amperage1963 Toyota programmed the hybrid ECU specifically for a NiMH pack and its characteristics, I've gotten by for the past year and change swapping out individual modules as they go bad but I decided that I was done with that and ordered a set of new cylindrical NiMH cells that'll drop in
there's a few lithium and sodium drop-in packs out there but they don't have a proper BMS. I think someone is working on that problem though