How Do Flow Batteries Work? The process begins with two tanks, each with its own active species. One tank is positive, and one tank is negative. Each tank flows into a cell tank containing an ionic membrane to keep them from mixing. As the solution flows out, power is released. When it flows back it is charging. The energy is determined by the size of the tank, and the power is determined by the size of the reactor located in the middle with the ionic membrane. Read More: https://www.modernthermaldesign.com/energy-products/flow-battery/