I am making a small binary counter circuit which will toggle states of an RGB LED as a small design project to practice both design and PCB layout. My design will incorporate two CR2032 batteries in series to provide power to the circuit.
I have calculated that at times (when all three LEDs are on) the current will be at ~20mA.
I have been reading about putting a capacitor in parallel with the batteries very close to them in the circuit to help with some current pulses in the circuit. It seems that there is some controversy about doing this. I was wondering if anyone can advise if this would be a good idea and if so how to select a proper capacitance value.