How can I get something like this to work?
Long story short, I often find myself doing small events, I have access to lots of these dewalt branded batteries I can borrow from work, so I wonder if there is a simple way to rig a bunch of PAR rgb lights to them - they are great for ambience, just point a few to surrounding trees and it makes everything much bigger and cooler looking but running mains power to ten plus lights which are spaced all around is a pain in the ass sometimes. So here are few questions:

Would the lights drain the batteries too quickly? Ideal setup would be one light per battery that lasts at 4+ hours at full brightness. If its doable how would I go about setting this kind of thing up? Oh and I wonder if the dewalt is too apple-cucked so they would have some kind of locking chip in them that talks only to their tools.