Apple and BYD developed advanced long-range batteries, but the iCar never materialized. Executives from the tech giant were reportedly shown early prototypes of BYD’s Blade battery. Apple ultimately backed away from the project and looked to work with other battery makers.

Apple worked with Chinese automaker BYD for years, developing batteries that helped lay the groundwork for tech used today, according to people familiar with the situation.

The details, which remained under wraps until now, come from people familiar with the situation who spoke to Bloomberg. According to the sources, the iPhone maker