It would be irresponsible for me to criticize a Lithium based car battery, either Lithium Ion or Lithium Iron Phosphate without further knowledge on my part regarding what, if anything, the people at Antigravity have done to counter the following two phenomenon:
The second issue is heat and fire. Most of us have heard of fires in homes that have been started by Lithium Ion batteries, which in their current state aren't the greatest fans of heat either.
I don't want to be a "gloomy gus." So let me counterbalance these concerns with two pluses.
First, it is generally recognized that Lithium Iron Phosphate LiFePO4 batteries tend to be very stable. Technically, this isn't true. More accurately stated it is the BMS or battery monitoring systems invariable found in the versions of these batteries that consumers don't make themselves with individual cells, that enable the batteries to be stable. So maybe similar controls will make Lithium Ion batteries safer.
Secondly, the ability to store more power in lighter weight lies at the future of electric propulsion. When I sought out a battery to run my dash camera, that could safely sit in the Wrangler cabin (i.e. Lead Acid not being a favored choice) and deal with the cold, I came across the Lead Crystal, a.k.a. Silicon Dioxide https://azimuthsolar.ca/reviews-resources-research/silicon-dioxide-lead-crystal-batteries/ chemistry. It seemed almost to good to be true in its ability to be discharged, recharged, immune to temperature, and stability. I had read about its use in military tanks, and its ability to be shot at and not only not become dangerous, but still operate.
Then I discovered their weight--which for their power is poor. Now, for my puny dash cam power needs, the difference in weight between this chemistry and others is minimal. But when we start talking about what's needed under the hood for ICE engine vehicles, let alone those whose propulsion is based on batteries, weight takes on greater and greater importance.
Final thought: that "hail mary" button on the anti-gravity batteries seems great, but a powerpack jump starter is currently cheaper and more portable among numerous vehicles.
Tesla uses Lithium Ion battery chemistry, with deference to the fact that not all Lithium Ion batteries, as alluded to, are the same.
Teslas also suffer from range decreases in cold, and the mechanisms that warm batteries up often come at the expense of robbing them of some of the very power that we'd hope that this heat would prevent them from losing.