I have two 1.5 volt batteries. I want to connect a 3v LED and a 3v PCB.
All I gotta do is put both in parallel?
Will there be enough current?
Do I need more batteries?

Thanks

 

You should keep this in one thread.
You need to post the data sheet for the LED, we have no idea of the LED current (Ifwd the forward LED current). Without knowing the LED current and voltage we can't begin to predict the battery life.

Ron

 

To answer your question we need to know the battery type, the LED current, and the PCB current.