Dual battery recommendations? Isloation?

I’m having trouble with my RZR going dead. Yes…it sets for a week or two at a time and gets short rides. And I know it’s my SSV stereo system that is probably draining it…

So, are most people just adding a second battery in parallel and putting a cut-off switch on it? Then use one for accessories and one to start with?

Pictures are great… 🙂