If you go on over to thier official websight they explain it pretty well. Basically they are a deepcell sealed battery. Deepcell batteries can hold more of a charge so if you are using alot of accessories it can power them for longer. Redtop is for all around use, but the Yellowtop is more geared towards stereo systems. The Bluetop is for marine/boat use(or to match a blue car)
http://www.optimabatteries.com (source, copyright, ect.)The OPTIMA RedTop"The looks alone generate plenty of buzz. But it's the patented SPIRALCELL® Technology in OPTIMA RedTop batteries that's truly worthy of praise. OPTIMA RedTop batteries are built to withstand the abuse Trucks, SUV's and 4x4's experience on and off-road. SPIRALCELL Technology immobilizes the internal components of the battery, enabling OPTIMA batteries to withstand incredible amounts of vibration.""Vehicles modified for better engine performance demand more from a battery. OPTIMA batteries withstand the high underhood temperatures associated with these Performance vehicles. The sealed cells make the battery spill-proof, even if you install it on its side! This prevents external gassing and leaking which can damage engine components and limit battery performance." "If your battery is used in vehicles that demand extra reliability and performance, or if you just take pride in getting the best performance out of your vehicle, OPTIMA RedTop batteries deliver the performance you demand."The OPTIMA YellowTop"Demand more from your vehicle? Then get more from your battery. OPTIMA YellowTop batteries are made for the extremes. If you have an extreme vehicle, you expect high performance. Whether your vehicle is made to take the abuse of off-road driving or cranking out decibels, you need more from your battery. OPTIMA batteries with patented SPIRALCELL® Technology deliver that performance. The deep cycle characteristic of this technology coupled with its extreme resistance to vibration provides performance vehicles with the repetitive power they need in a spill-proof package.""If your vehicle has a lot of accessories like running lights, high-performance stereo/AV system, winches, or hydraulics, your vehicle demands more from its battery. OPTIMA YellowTOP batteries provide the extra performance and deep cycling capability that your vehicle demands."