A hidden partnership between Apple and Chinese automaker BYD has come to light, revealing a years-long effort to co-develop long-range EV battery technology. The breakthrough batteries now power BYDs electric vehicles,

Apple's collaboration with Chinese battery company BYD on battery development for its now-canceled Apple Car project has been revealed.

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