I cant give you an equation that predicts what this resistor should be. I can only suggest that you experiment with the value until satisfaction is obtained. The two resistors, r 1 and r 2, are used to divide the battery voltage down to the see more 4.6v range for the voltage monitor. The hysteresis resistor, r h, affects this calculation. Calculate the value of r 2 for the under voltage protection circuit.
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