Battery issues

I have had a similar issue with a drain in my Duster's electrical system. Simple solution until i rewire the engine compartment.... I went to Advance auto parts and bought a battery cut off switch. it mounts to the negative post and has a brass crossover bar like a handle and I just break the connection when the car is parked. My battery stays charged and charges when I drive the car so I do not worry about charging issues. i think the draw is from my stereo but not sure as of yet.