Or rather from Panasonic. That's where Tesla get's its batteries from.
(Tesla financed the Gigafactory, but it is operated by Panasonic, and they previously bought their lithium-battery cells from Panasonic. This is according to Tesla's own 10-K filings [1,2]).
The range is probably not China's concern so much as emissions. Even mild hybrids reduce co2 emissions considerably (around a third). That's not accounting for the ability to power accessories without running the engine in gridlocked traffic.