Gravity feed flow battery system and method

A flow battery system, comprising:

• a battery stack including a battery cell, half of the battery cell being a half-cell utilizing positive terminal liquid electrolyte and another half of the battery cell being a second half-cell utilizing a negative terminal liquid electrolyte;
• a first gravity feed system, including at least a first storage tank and a first standpipe for storing the positive terminal liquid electrolyte, designed to generate a first hydrostatic pressure in the first standpipe for the positive terminal liquid electrolyte in the first standpipe sufficient to force the positive terminal liquid electrolyte to be fed from the first gravity feed system through the first half-cell;
• a second gravity feed system, including at least a second storage tank and a second standpipe for storing the negative terminal liquid electrolyte, designed to generate a second hydrostatic pressure in the second standpipe for the negative terminal liquid electrolyte in the second standpipe sufficient to force the negative terminal liquid electrolyte to be fed from the second gravity feed system through the second half-cell;
• a first return system to return the positive terminal liquid electrolyte from the first half-cell to the first gravity feed system;
• and
• a second return system to return the negative terminal liquid electrolyte from the second half-cell to the first gravity feed system.