I am trying to use LEDs to light up a hat. To make things "simple", I am trying to use some puck type LEDs that I already have. These are setup as:

|- Battery----resistor---LED-|
|---------------------------|
These are in a nice plastic setting.

I would like to connect 8 of these to one switch. I am not very familiar with electronics but I did put a switch into one of these so it looks like


|- Battery-Switch---resistor---LED-|
|----------------------------------|
This worked fine. The question is, can I hook multiple LED circuits up to one switch when they all have their own batteries? I am not sure if that would qualify as a series or parallel connection.

|-Battery-Switch-resistor-LED-Battery-resistor-LED-Battery-resistor-LED-|
|----------------------------------------------------------------------|


I am thinking the advantage is I don't have to create some new battery holders since each of these light circuits is already in a self contained plastic holder. Would this work or is it just a bad idea?

 

Do you mean that you break the existing return from the LED to the battery, and insert the next identical unit into the chain, and then bring the return of the last LED back to the first battery? That should be OK.