So it's better to power the Arduino from 5V pin than Vin pin?
I checked and the converter can supply up to 5A and my battery reads 3.2 A so I guess that's too little. I need to limit it.
I use the FastLED library and I have used the limiting function, set to "FastLED.setMaxPowerInVoltsAndMilliamps(5, 3200);".
My HC-06 says 3.6-6V so that would probably run fine on 5V too which means I could use it on a Nano. Any other disadvantages of using a Nano rather than a Uno for this?