I've had my batteries run low on quads and motorcycles and survived while riding alone. I could always find a hill big enough to bump start them. Sometimes after a long push through sand. But with a SXS, it isn't an option. And considering I will probably ride alone often, I need a little education on this subject. Do these batteries go bad suddenly or start showing signs-slow turning over? I don't expect to have many devices drawing high amps, no big audio system. For me, what would be the pros or cons for second battery or power pack.