If you have a set of led lights (or other battery powered device) that you want to turn on and off from a distance, here's a simple idea using an inexpensive set of Wireless Remote Control 12V DC Relays. To keep things fairly universal I decided to make an 'inline' cable that has a male and female D-Tap connection to work with my V-Mount batteries. (This way I don't need to modify any of my accessories). But while i'm using this with my v-mount batteries, you can actually use any 12V-14V battery and any cable connector to fit the connector on your device.
These specific mini wireless remote DC relays can handle up to 10A sustained which is the same max rating most V-Mount batteries are spec'd for. Which basically means if you can power your accessory from a D-tap, these relays should work fine. My setup here is simple, and it's merely just cutting the battery current, so this hack won't let you dim or change color temp, but it's universal enough to be used for powering anything on or off including motors, LCD screens, Wireless Video Transmitters, etc.
You can find this set of (6) wireless remote control 12V DC relays via Amazon (here). I've already a few more ideas in my head on how i'll be using this idea, but if you have any you think these would be good for, let me know in the comments.