I'm willing to go out on a limb and say maybe 1 in 10 complaints about a bad battery actually turn out to be the battery. Usually it's a wiring problem like the fusible links if equipped, ignition switch, loose connections, corrosion, inadequate charging system, etc. Then, when you add on aftermarket systems, it can get real complicated. One issue to be carefull regarding any side post battery is the length of the stud used to attach the cable. If it is long enough to touch the back of the battery terminal on the positive side, it can short out the cells inside and cause premature failure. This was a memo I recieved from Johnson Controls who manufacture most of the aftermarket replacement batteries for automotive stores, shops, etc. -Jabin