Tesla’s 4680 battery program faces a reality check as in-house cells lag in real-world performance.
The initiative aims to reduce manufacturing costs and end reliance on external battery partners.
European Model Y Long Range vehicles using 4680 batteries show lower energy density than LG Energy Solution versions.
These in-house packs deliver less driving range than models equipped with hardware from established suppliers.
The performance gap underscores the technological challenges Tesla faces in achieving battery independence.