Batteries are fairly small part of their business I think. Batteries are also on their way to being commoditised - especially the manufacture of them.
Yep, battery cells are becoming similar to solar panels. High volume/low margins with real but small differences between successful manufacturers.
I think it's almost a certainly that we are on the cusp of a battery shortage, quite likely for at least the next decade.
Most automakers are currently largely blowing off transition to EVs and acquiring a battery supply for that. At some point, it seems near certain that their hands will be forced and they will be vying for supply from a small number of global players.
Yes, I'd expect existing Chinese companies and new startups in China to somewhat offset this with increasing volumes and improving quality... but, I still think we are on the verge of demand heavily outstripping supply for a decade plus. It's going to take something like $500 billion in new manufacturing capacity buildup to supply the auto industry... and energy storage might take off and add similar scale of demand for these cells.
I wouldn't expect the thin margins of a commoditized business anytime soon. One of my only concerns about Tesla is actually how reliant they are on Panasonic vs. being able to go forward without them if need be. It's not a major concern for me... but by the mid-late 2020s, perhaps Tesla will be competing with the likes of Toyota for Panasonic's next battery plant investments.
I can see why someone would take some time to explore Panasonic as a potential investment.