this may sound like a stupid question, but here goes. I have a Marathon 6 volt battery pack but i can not remember how to use it as it is so long ago that I purchased it. I have only recently began another modelling project so i never got to use the battery pack before and now I have forgotten how it is used. Is it something to do with the receiver. I know it has to be charged up but what do I plug it into or what is it attached to?