It missed us by 9 days

So, during one of these events, it can burn out the electric grid and any unprotected electronics which basically kills most if not all of the things we use, and with vehicles they no longer run because of the damage done to the cars electronics and I am wondering what it will do to an electric car, most importantly to the huge battery packs in them.  They are having some fire issues with them now and I am wondering if they could potentially start on fire because of the overload the pulse would dump into them?   Does anyone know what would happen?  I have never heard what an EMP does to large battery packs.