I want to power one 3V LED with a 3V source. Let's say I'm using a 10 Ohm limiting resistor, and the LED eats 20mA of current. Using a CR1225 with 50mAh capacity that will last for about 2.5h.
What if I connected another 10 Ohm in parallel with the diode + limiting resistor? The voltage across would still be 3V - enough for the LED - but the current going through the LED would be halved. What about the total power consumed by the circuit?
I don't mind if the LED gets dimmer, I'm ok running 10mA or less through it. All I want is to increase the amount of time it emits light.
Would that work?