I have a question about zener diodes. If there is an input to a zener it drops the volts to its specs (4.3v in my case), my question is once the input is cut will the zener continue to feed power until its drained? I hope this question makes sense and somebody knows the answer.
We use Zener diodes to shunt excess voltage through a resistor(200ohm is common) so the mcu is only exposed to the Zener voltage of 4.3V. Generally they are used in multicell applications where the voltage of the cells is between 8.4V full and 5.5V empty. Since the Zener voltage is below the empty cell voltage it’s possible to over drain cells unless some form of lock out is used, either loosening the tail cap or a clicky that breaks the circuit completely. A light with just a momentary switch that temporarily interrupts power to change modes or turn the mcu off will still allow the Zener to bleed current. Hope this helps.
It sounds like you are thinking that a zener diode stores power / energy, it does not store any energy. Capacitors “caps” are the components that store a small amount of energy.