NOVELTY - The floor scrubber (10) has a drive motor which is in electrical communication with a battery compartment (26) via the electrical system. A power converter module (34) is received in the battery compartment, and includes a fuel tank (38), an internal combustion engine (40), a generator (42), and a set of batteries (44). The internal combustion engine is connected to the fuel tank. The generator is connected to and driven by the internal combustion engine. The battery is connected to the generator, and is adapted for connection to electrical system of battery-operated vehicle.    USE - Battery-operated vehicle e.g. floor scrubber, fork lift, ice resurfacer.    ADVANTAGE - Allows the user to have the benefits of minimization of the downtime required for recharging and flexibility in method of powering since the power converter module allows for the operation of the operation of the battery-operated vehicle from the combustible fuel by swapping the battery module out for the power converter module. Reduces the weight of the floor scrubber which increases the efficiency since the set of batteries need not be charged nor be capable of holding charge significant enough to power the floor scrubber independent of the operation of the internal combustion engine which allows for the reduction in the size of the batteries. Provides clean power necessary to operate the drive motor and other electrical-operated components of the floor scrubber without spikes in supply of power and without brief interruptions in the supply of power since the set of batteries acts as pass-through for the electric current to smooth the electric current.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the power converter module.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the battery-operated vehicle with the power converter module partially inserted into the battery compartment.    Floor scrubber (10)    Battery compartment (26)    Power converter module (34)    Fuel tank (38)    Internal combustion engine (40)    Generator (42)    Battery (44)