Power switch wiring. Need help Please

[nuky nuclear]

I am wondering how to connect the power switch so that it will turn on both the system and the screen. Do i have to run the batteries to the switch before running them to both the screen and the system? I am really clueless about this. I do have a protection circuit module, and i dont know if i am supposed to connect the power switch to that or just the batteries and charger. i have the batteries set as a series.

[APHawkes]

Put the switch as close to the battery as possible. That way the switch will control power the screen and system simultaneously. The protection circuit is only for charging, right? So, it shouldn't be through the switch at all, as you don't want to have to turn the system on to charge batteries (I'm looking at you, PS3).