I wanted to add a keymod on my rifle and wanted to keep it front wired. I've read many conflicting thoughts on keeping a battery constantly plugged in so I decided to do a little modification. I looked around the net and found no info on running a switch to the battery to cut power while leaving the battery connected at all times, but I decided to give it a try. I found it to work great!
I put a small on/off switch on the positive wire between the battery and mosfet. I then mounted the switch on the bottom outside of the keymod for fast switching. Sliding the keymod over the barrel was snug but everything looks great and I can still pull out the the charging cable through any grove on the keymod. I have some rubber rail cover/grips on order which will completely hide the battery and wires.