Power Options/Limited Battery Space


I’ve been developing a lightsaber on and off (mostly off) for over a year. After learning that the batteries I was planning on using weren’t powerful enough, I switched to 2 18650 Li-ion batteries. The problem is that these batteries make my hilt way too long–12 inches!

(Frankly, I don’t know how anyone makes a hilt that’s significantly shorter than this using 2 18650 batteries and the Propboard. If you have any ideas, please let me know!)

To compensate, I’m considering going with the lower-power mode of the Propboard, so I only need 1 of the 18650 batteries. I’ll change the power settings of the Propboard using the method here.

I’ve got a couple of quick questions about this:

  1. What kind of LED should I use for this lower-power lightsaber? I had been using a CreeXPE2.
  2. Are there any other hardware considerations I need to make for this lower-power mode? Or is the LED the only thing I need to worry about? (I imagine the speaker doesn’t draw much power?)


Hello @Joecool,

1-battery setups are ok. I have a test fixture with 1 battery on my own that I use to debug motion-related code.

  1. CreeXPE2 is fine.
  2. Audio might sound a little lower, but you may not notice it.