China is a massive economy and country with some of the most advanced manufacturering and tooling in the entire world. Yes, it could be shoddy, but it's in a ship and is going to be far more regoriously scrutinized by their regulatory bodies than a normal stationary battery would be. I understand the plausiblity of your comment, but it seems to be rooted in prejudice or extreme ignorance.

Posting this while Boeing is killing whistleblowers for talking about how many corners they're cutting is absolutely wild lmao

Are you kidding me? iPhones and most smartphones and laptops are Chinese products. The vast majority of high speed rail in the world are Chinese products. The Tiangong space station is largely Chinese products.