I have seen some of these coming up on the bay
https://www.ebay.com/itm/166052337804 .Unfortunately the US prohibits export of these .But if you are in the market for a battery with a 75yr design life (these aren't some sandal wearing hipster light weight. There is a paper reviewing them at 30yrs in service showing that they exceeded expectations) have the room and floor to support these could be a very good alternative for off grid at way less then lithium's. I also find it interesting that although being designed in the 60's and produced through the 70's to 95 by only two manufacturers that the chemistry used in these is only now finding its way into main stream deep cycle batteries.
