this is what my deal looks like .. small radio type pigtail soldered to the battery pack .
a receiver box with on/off switch mounted inside , battery plugs into switch ,
switch plugs into receiver ..hope this helps
The easiest is to get a male servo lead (or battery lead) from your hobby shop (or a spare from a old servo or lead). Several companies make them such as MPI. Then solder the pos/neg leads to the batteriy pos/neg. This can either be connected directly to the battery (easiest) or to another lead (i.e. deans 12guage) that is connected to the battery (although the additional lead is not necessary). You will then be able to plug the battery into a radio switch.
An alternative method is to use deans or sermos plugs on the end of the battery and then add a deans/sermos in the place of the futaba/jr plug on the switch lead.