No. BYD is neither one of the largest car makers of China nor does this imply cars at all. If you buy an electric toothbrush at German drug store „dm“ for €20 and rip it apart, you‘ll find a BYD li-ion battery. https://imgur.com/gallery/kp6eULc
> BYD is neither one of the largest car makers of China
Off-topic note: BYD used to be the largest Chinese passenger car maker in 2008-2013 but has declined significantly in recent years compared to competition. It's still #1 for EV car sales global though (Chinese bought 4x more EVs than US).
BYD batteries are everywhere.