For a portable application, I would be using a single 3.7V 2600mAh li-ion cell. The circuit requires 2.5V to 5V to function with the current requirement being 100mA.
So obviously a voltage regulator is required.
I would want to know for how long, using an appropriate regulator, could the cell power the circuitry continuously. Is it almost 20 hours? I guess the health of the cell also needs to be considered, so it should not be discharged below 3.3V, right? If we consider this, then what will be the run time?
Thanks.