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Lead acid batteries also recycle in to reloaded bullets. You can use subsonic loads with just cast lead or swag the bullets into casings and get into higher performance hunting loads.

Assuming off grid prepper mentality is being used.

I fully expect to get another 5 years out of this set. As long as we get back to float the next day, capacity diminishing doesn't really matter for a house. That's more a function of sizing the input and output to the system than battery capacity.

Out of curiosity, technical question: do you use catalytic caps on the cells to recover water from the hydrogen outgassing?

>the Tesla battery pack is very difficult to recycle.

Are you sure about this? Lead-acid batteries are highly recyclable, but lithium cells are straightforward to recycle, too. I know that Tesla has a recycling center set up at their gigafactory.