Comment by jeffbee

Apple sources batteries mostly outside of China and generally has avoided the Chinese batteries (which are almost uniformly garbage) preferring Samsung and TDK production in Japan, S. Korea, and India.

There is an absolutely insane amount of fraud in the Chinese component industry and for a high-risk item like a phone battery the risk simply is not worth it. Google sources Pixel batteries in China, and they also have a reputation for shipping problematic batteries.