I have a bescor battery pack that I use a to power a 128 led light mounted on top of my camera (7D). The battery is huge, about 15 lbs. and it straps on like a belt around my waist. This battery has so much juice in it that I would like to power both my camera and light off of it at the same time, and maybe other accessories in the future (external monitor). I have tried searching the internet for an adapter that would let me run both, or more but I am lost. mMybe there is something I haven't thought of yet.
The battery pack has a cigarette lighter type output. I found that canon has the DR-E6 DC Coupler but i would need an adapter to be able to connect it and the light to the battery pack. Is this even possible and can someone steer me towards the adapter that would meet my needs. Thanks