/diy/ - Do It Yourself

Hi DIY!
/cgl/ cosplayer here wondering why my remote controlled smoke machine does not want to turn off.
My circuit is:
A 3.7V 18650 li-ion battery
A rc mini relay receiver
A cartomizer to evaporate the fog liquid
A tiny air pump to pump the fog out the cartomizer
A mosfet to reduce the current needed for the cartomizer since the rc receiver cannot handle it.

So it does actually work, it just doesn't want to turn off with the remote control. It does turn off when I use the learning button on the receiver, but that would defeat the RC purpose.
Sometimes it actually turns off, and it depends on the battery i use, which makes me wonder if the voltage over different batteries is the culprit.