| The Red Top is designed to be used as a starting battery in a passenger vehicle with little or no aftermarket accessories (less than 400 watts). The two main reasons a Z owner would want to consider a Yellow Top are 1) "high powered" stereos over 400W, and 2) aftermarket alarms left on when your car is stored for a long period, as in the winter. According to Optima, if you use a Red Top for aftermarket accessories greater than 400W, this voids the warranty. How Optima would know what you have hooked up to your car is a separate issue that I won't go into. The Yellow Top is designed to be drained 60-70% and then recharged or cycled regularly. That is what is meant by "deep cycle;" more reserve power. The Red Top has more "peak" power but will drain faster. The typical drain on a battery for starting, lighting, and ignition (SLI) and with "light" accessory use is 1-3%. If a Red Top is drained too deeply, too often, the battery life will be shortened proportionally to how often this cycle occurs. The Yellow Top costs significantly more and only carries a one year warranty compared to the Red Top's three year full replacement / seven year pro-rated warranty. Read the FAQ on [ www.optimabatteries.com ] if you have more questions. Hope this helps :c) Taken from [ www.twinturbo.info ]
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