@soapone @D-Droid :cirnolaughing: But, seriously, they're good at lithium iron phosphate batteries (LiFePO4), like to the point they have or had a monopoly in making them. Those are not so good in terms of energy density, so they're not going to take over the smartphone market, but they're good for a bunch of uses including cars where that's not quite at such a premium. https://en.wikipedia.org/wiki/Lithium_iron_phosphate_battery