Well, it definitely lasts longer than the battery in my cell phone :) Judging from the description it almost sounds a solid state battery. A battery that many firms are working as it has many advantages over our current lithium ion batteries which use a liquid electrolyte. Something that also makes them highly flammable if the separator is somehow breached. Something that makes fires in EVs very hard to put out once the thermal runaway process has started. They can also reignite even if the initial fire has been put out which is why some fire department put EV wrecks in large containers filled with water. It is very interesting to see that this old battery seems to already incorporate technology that we are now trying to reinvent.