I found a page couple of pages on how to make cannos and selecting batteries I'm posting this to have people reveiw it and se if it seems right. http://www.instructables.com/id/How-to-Build-and-Arm-a-Scale-Model-Battleship-From-1/step8/Selecting-and-Assembling-Your-Cannon/ http://www.instructables.com/id/How-to-Build-and-Arm-a-Scale-Model-Battleship-From-1/step14/Battery-Basics-Selecting-a-Battery-Thats-Right-/
This actually looks like instructions of how to assemble a cannon sold by BDE, and it's not going to do you any good. Strike Models bought BDE a few years ago, and I believe they do not carry that cannon.
that'd be a neat trick since the instructables page says it was created last year. Though the underlying content was probably elsewhere in the wilds of the net prior to that.