The typical life of a deep cycle battery is:

Starting (Used as a deep cycle) 0 to 12 months
Marine to 6 years
Golf Cart to 6 years
Gelled deep cycle to 8 years
AGM to 10 years
Ni-Cad to 10 years
Telecommunications (Float) to 10 years
Fork Lift to 10 years
Industrial (Traction) to 20 years
Industrial (Stationary) to 20 years
Ni-Fe to 20 years

7.1. Recharging slowly and keeping your battery well maintained are the best ways to extend the life of your battery.

7.2. Recharge a deep cycle battery as soon as possible after each use to prevent sulfation.

7.3. In warmer climates and during the summer, "watering" is required more often. Check the electrolyte levels and add distilled water, if required. Never add electrolyte to a battery that is not fully charged-just add distilled water and do not overfill. The plates must be covered at all times.

7.4. High ambient temperatures (above 80o F [26.7o C]) will shorten battery life because it increases positive grid corrosion and growth.

7.5. Shallower the average depth-of-discharge (DoD), increases the battery life. For example, a battery with an average of 50% DoD will last twice as long or more as an 80% DoD; a 20% DoD battery will last five times longer than a 50% DoD. For example, golf cart batteries will average 225 cycles at 80% DoD and increase to 750 cycles at 50% DoD. Try to avoid DoD that is less than 10% or greater than 80%. Industrial traction and stationary deep cycle batteries are designed for 80% DoD and most marine an RV deep cycle batteries are designed for 50% DoD.

Depth-of-Discharge (DoD)
[Source: Concorde]

7.6. When in storage, recharging when the State-of-Charge drops to 80% or below will prevent lead sulfation.

7.7. Maintaining the correct state-of-charge while in storage, electrolyte levels, tightening loose hold-down clamps and terminals, and removing corrosion is normally the only preventive maintenance required for a deep cycle battery.

7.8. Avoid "opportunity charging." Size the battery so that there is a minimum of one cycle per day.

7.9. NEVER discharge below 10.5 volts.

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