I have a circuit board I made, very simple, you connect a 9 volt battery to it, power opens a relay, and turns on a green led, there is a zener diode (6.1v maybe, cant remember) for a flashing red led, the led flashes if the voltage drops below the voltage of the zener diode. My questions are; 1.) If I add capacitors to this, will it extend battery life (about 4 hours right now) 2.) If 1 is yes, what kind of capacitor will I use? I work with capacitors every day, but bigger ones like 5mf 330V, 35mf 440v, dont know much about the smaller ones. 3.) If you can make something better, please let me know, it needs a power light, a low battery light, and a relay (SPDT, 9 volt battery is on the coils to keep relay open). Ideally I would like this board to have a long battery life. Any help would be great.