Battery fluid supply system

The present invention relates to liquid electrolytic batteries and, more particularly, to a fluid supply system for replenishing liquid electrolyte in the batteries. A system for supplying fluid to a battery, a vehicle and a method for supplying fluid to a battery. The fluid supply system supplies fluid to a battery in a vehicle selectively powered by the battery, the vehicle including a frame supporting the battery, the battery including a battery cell, fluid being transmittable to the cell, gas generated during charging of the battery being transmittable out of the cell. The system is defined as including a tank for holding fluid, and a hydraulic circuit connecting the battery to the tank. The hydraulic circuit is defined as including an inlet conduit connectable between the tank and the cell, and an outlet conduit connectable between the cell and the tank, gas produced during charging causing fluid flow through the outlet conduit and to the tank. In the fluid supply system of the present invention, the gas produced during charging causes fluid flow through the system.