Firstly, I know the robot must have an LED on show when its on but I'm curious to see what some of you guys have done for yours?
For my Middleweight, I wire two LEDs in series directly into the main power wiring, each with with a 24v resistor in them so that each only uses 13.2v (from my 8S LiFe setup).

Secondly, Where abouts have you guys put your removable link? I know it needs to be able to be put in and pulled out with the robots top on (giggidy ), but I'm worried about it being pulled out mid battle.
I put mine on the top of my Middleweight, works fine though I have a short loop and some raised side armour to prevent robots directly attacking it. On my featherweight, I put it on the rear, at the top of the robot so whilst you couldn't directly attack it, it would get damaged if flipped on its back.