[Jeff Stout]

Don't know about yellow but I thought blue was for boats, charge it once and let it run down until it runs out of power. If charged before nearly drained than it will have a shortened life. Not good for race car. Red top is for cars with charging systems that can charge battery after start up or for cars without alternator to be charged back up during a run. Hope I didn't confuse anyone, just going by what I have heard in the pits.