They used to, maybe 5-6 years back when they were still using the most common 18650 format. With the switch to 21700 and 4680 batteries, they make their own (i

They used to, maybe 5-6 years back when they were still using the most common 18650 format. With the switch to 21700 and 4680 batteries, they make their own (in China and I think some other US-based gigafactory)