Megapack runs on LFP as do SR Model 3s. Ultium are NCMA (less weight).Do you know where they are expecting the cells to come from for the Lathrop megapack factory? Presumably from China? I doubt and of the US battery plants will have any spare capacity with Semi and CT ramping? I guess that means that storage won't benefit from the IRA for a while.
Maybe there will be some spare Ultium cells floating around.
LFP are also typically not cylindrical in vehicles.
It's reported CATL recently recieved a 45GWh order from Tesla with more in the works.