The Prius batteries in particular are or were readily available. Many cars get totaled and only very few Prius ever need a battery
replaced, so there are lots in junkyards and there is no real market other than the recycle one, so prices are or used to be pretty good.
I've wondered about using them as a house bank but haven't bothered. The older Prius batteries are NIMH I believe and the Prius will not charge them over 80% nor discharge less than 40% I think to extend battery
Having said that its not as much power as you might think, I believe their real advantage is that they can be very rapidly charged and discharged.
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