SYSTEM, APPARATUS, AND METHOD FOR A MODULAR POWER SOURCE

Provided herein is a system, apparatus, and method for a modular power source that can operate to extend the range of a battery electric vehicle and/or power accessories. Embodiments provided herein may include a battery electric vehicle including: a vehicle frame; a high-voltage battery; at least one electric motor; a modular power source comprising: a subframe; an internal combustion engine mounted to the subframe; and a cooling system mounted to the subframe, where the cooling system is in fluid communication with the internal combustion engine, where the subframe is configured to attach to a vehicle frame, and wherein the subframe structurally supports the internal combustion engine and cooling system.