crews found 200 pounds of lithium-ion batteries in the garage .... Investigators are now trying to determine what kind of business the homeowner was running.
sourceThe electrolyte is typically a mixture of organic carbonates such as ethylene carbonate or diethyl carbonate containing complexes of lithium ions. These non-aqueous electrolytes generally use non-coordinating anion salts such as lithium hexafluorophosphate (LiPF6), lithium hexafluoroarsenate monohydrate (LiAsF6), lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4), and lithium triflate (LiCF3SO3).
Business? That isn't very much li-ion. Almost exactly 2000 18650. Just barely enough to make a useful DIY powerwall.
This is probably going to happen more often and more and more homes and businesses install batteries. Regions that makes it harder to sell electricity back to the grid are going to force more people to install them.