Tesla patent reveals dual-battery system for trailer-mounted range extender
A newly published Tesla patent application describes a sophisticated dual-battery management system designed to integrate an auxiliary battery pack with a vehicle’s primary pack — including a configuration where the auxiliary battery lives inside a towed trailer.
The patent was filed in August 2024, months before Tesla officially cancelled the Cybertruck’s bed-mounted range extender, suggesting the automaker’s engineering team continued developing the underlying technology even as the original product was being abandoned.