Now, I'm not mentioning any names because this guy is certified. Nor am I being obvious about anything. Let's call this company 'coil' and their new battery which was first developed for the coil car. To be worthwhile this needs tremendous energy density, eventually on the order of gasoline. These things blow up when hit, and the coil car needed a titanium bottom.
So what happens in an earthquake? All of these things are slated to go into the soft-garages of the Bay area houses. Do they have titanium? Can they survive a brick hitting them? Or a rebar going through? I think not. All these houses have automatic gas shut-offs, there is no way to shut down the battery automatically or discharge it safely.
Think of a whole California city filled with these things. :(