Which Boeing aircraft was the first to fly with a lithium-ion battery system as standard equipment?

The Boeing 787 Dreamliner was the first commercial aircraft to use lithium-ion batteries as standard equipment.

Boeing selected lithium-ion batteries for the 787’s main and auxiliary power systems because they offer high energy density and lower weight than many traditional battery technologies. The aircraft’s broader electrical architecture also reduced reliance on engine-driven pneumatic systems, making electrical power central to several functions.

The choice created significant operational challenges. In January 2013, battery fires led to the temporary worldwide grounding of the 787 fleet. Investigations produced changes to battery containment, monitoring, and installation before regulators allowed the aircraft to return to service.

Lithium-ion batteries are not the same as the aircraft’s composite structure, although both technologies are often mentioned together when discussing the 787. The Dreamliner is notable for both innovations, but the battery milestone concerns its electrical systems rather than its fuselage construction.