Hey All. Need a little advice, I just purchased a 2013 Tahoe, and I noticed that there is a spare battery tray in the engine area. I'm planning on putting in stereo system(nothing to powerful and I won't be running it while the engine is off either). I did my research and I'm interested in the XS battery(as a secondary battery) but I need to know what's the best way to hook it up. Please help! If anybody has pics of their setup would you include it with your response. Thanks