Cost vs. plug count. As semi-solid loading increases, the cost benefit of a flow battery architecture rapidly diminishes.
 1st generation GIFcell.
 1st generation GIFcell testing, flow controlled by syringe pumps.
 2nd generation GIFcell.
 2nd generation GIFcell testing, flow driven by gravity and controlled by battery angle.
 3rd generation GIFcell, flow driven by gravity and controlled by battery angle and pneumatic resistor.
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