No, what Tesla does best, is lose money by the armored truckload.
Careful, Captain, we are on hallowed ground.
Your story implies cause and effect but that can't be determined. That's an anecdote, though if you have an article about it I'd like to read it.
Is someone outcompeting Tesla on the battery-powered car front? Does someone else have exclusive battery tech which will run Tesla out of business? If you follow battery tech, you'll find that advances in battery chemistry have been slow and dogged but consistent. A lot of different places, mostly material science departments at colleges, are making the regular plodding advances. A lot of places and a lot of scientific publications.
Tesla on their own cannot hope to compete with that volume of research though they could contribute to it if they wanted. However they can license any new tech when it comes out. Division of labor keeps Tesla doing what they do best, making electric cars, and the material scientists doing what they do best, making battery tech advances.
Well, that was insider information and why I left out the name of the company. There were many other factors that contributed, but there was significant arrogance in other areas, too, IMO.
As far as Tesla knowing how to manufacture electric cars, or even cars in general, Musk is on record saying that they had a lot to learn, and on record saying that their lack of understanding of the manufacturing process was at least partly responsible for the losses that Tesla incurred.
IMO, if anything, Tesla is a lesson on how not to run a company, yet, Musk is a leader in bloviating how fantastic he and his vehicles are while losing hundreds of millions of dollars a month.
There are many other manufacturers that are planning on bringing out EVs in the not too distant future, and at least a few of those are actively doing battery research. And more importantly, IMO, is they don't bloviate about how they are going to save the world. As I see it, they want to make a quality product.
My bet is that those manufacturers will do a much better job quality wise in the production of their EVs.
The Leaf, on its own, is successful; what it does not have, and does not need, IMO, is stupid acceleration that you literally can't use anywhere legally, yet is a magnet for those who are testosterone challenged.
Musk saying he thinks that Tesla may be 10-months from folding is either him facing honestly the fact that Tesla, beyond making an EV, is nowhere near the definition of a successful business, or yet another bloviating stunt of his that he hopes to turn into a fundraiser.
And about battery capacity -
https://phys.org/news/2019-01-tiny-silicon-particles-power-lithium.html Some day, the tech will be there, and if I were leading a company that depended on high-capacity batteries, I would be attempting to work with any university doing research that looks so promising.