Top it how cheap batteries have gotten it makes little sense to remanufacture unless you are extremely dedicated DIYer, live somewhere with very cheap labour or it's done in massive scale to achieve economies of scale.
In NZ you can get 60KWh used Tesla battery for 6-10k NZD, then spend another 1-2k for additional gear + labour to hack it (overall $116-200/KWh) or 15KWh for 3.5k ($233/KWh) with warranty and safety guarantees.
In NZ you can get 60KWh used Tesla battery for 6-10k NZD, then spend another 1-2k for additional gear + labour to hack it (overall $116-200/KWh) or 15KWh for 3.5k ($233/KWh) with warranty and safety guarantees.