One thing everyone needs to keep in mind is that the Optima batteries are AGM (Absorbed Glass Mat) and even though some are sold as a cranking battery, an AGM battery was never designed for that initially (they were intended for long term slow discharge and extended storage in hot climates). Cranking batteries are designed for very fast, high capacity discharging (which is done best by a lead acid battery). An AGM that is desiged specifically for starting will work as intended but one which is intended for deep cycle will start to fail if you use it for starting over time. A lead acid can be drawn to 80% of its rated capacity and recover while an AGM can only be discharged at 50% of its capacity to recover (which if you buy an AGM specified for deep cycle, they will not tolerate a deep discharge which starting could cause). Misuse an AGM and it will only live as long as a lead acid would have and cost you much more.
AGM batteries are awesome but you definitely need to purchase the correct one for your aplication. If you intend to use your winch alot, then I would look into a dual battery system with an isolator, get a cranking for cranking and get the largest deep cycle you can fit, isolate it and connect your stereo, lights and winch to it.
