Another key reason CATL, BYD, and others are investing in sodium-ion batteries is to mitigate rising lithium prices. Sodium ...

Most of us rarely stop to think about what’s actually powering our devices. We plug them in, watch for a little charging icon or indicator to light up, and hope the battery survives another long day.

The iPhone’s battery is easily one of its most important features. There may be no upgrade as universally appealing as the promise of better battery life. But despite the battery’s importance, iOS has ...