Endurance testing. At 50% brightness, running for 15 minutes, battery voltage went from 4.12V to 4.10V. Consider that most performances will be less than 5 minutes, this is a great sign. Granted, the battery is still only driving the LED strings. Once I get the actual controller board made, it’ll be driving the controller as well, probably somewhere around 500mA of additional draw.
How long are the Ashley?
Getting close to an hour of cycling through the same 47 images, battery hasn’t dropped below 4V … Considering that the cut off on the LPD drivers is at 2.7V, I’ve got a long way to go to get there (battery will cut off at 2.8V anyway.) 
@Larry1 , at current measurements, I’m looking at 17" long, which is too long for my own comfort, but for now there isn’t much I can do. I need to completely re-engineer the LED strips to make them shorter, or figure out a way to put the controller inside the hollow square strings. That’ll will have to be a future revision.
The other commercial (and very limited) version of this is 2" longer.
Mine is much smaller. I believe its around 12" I tried to keep mine as close to a glow stick as possible.
You probably also don’t have as many LEDs packed together as I have. If I redo the LED strings I might be able to shorten it by another 2" … But like I said, I have to redesign them from scratch.
No sir. I don’t think I would dare try that many leds. My head might expode trying to wire everything.
4 wires causes your head to explode? 
Do you have any pictures of the inside?
Eh, no. Only because it’s only the strips right now. The controller is still sitting on a breadboard. But, imagine four strips, arranged in a hollow square formation. They’re LPD8806 drivers so four wires for each strip. Their tied together so I only have to deal with one single pair of DATA and CLK.
Two and a half hours, battery voltage reads 3.9V.
@Ashley_M_Kirchner_No What battery are you using?
At the three hours mark, battery voltage measure 3.85V. That’s 0.27V in the last three hours. At that rate I calculate roughly 15 hours before it reaches its cut-off point.
Now this is all relative of course. If I’m using images that are very white or that use all 48 pixels (times four sides), that time will be much shorter of course.
@Michael_Sharnet , it’s a single Li-Ion battery driving the whole setup, all 192 LEDs and 96 drivers.
3.75V at the four hour mark. I went back and reread the specs on the battery and it can actually run all the way down to 2.0V. I have a fixed 2.8V limit imposed because the drivers will quit at 2.7V … I’m still amazed at how long this is lasting.
Wow, that’s some incredible longevity. I’m impressed.
I stopped after 7 hours as that is well above the 5 MINUTES minimum requirement that I have.