When the battery looses it charge. It is designed to be run completely down before recharging.
Nickel Cadmium batteries can last through about 2000 recharge cycles.
You can not really recharge the water cycle, it is an ongoing natural process.
Rechargeable batteries usually last 300 to 500 cycles which is when a battery is at 100%, then is drained to 0% and charged again. Even if you do not drain it completely and recharge the battery, it is still considered a cycle.
For Australian made deep cycle batteries, try the related links.
Deep-cycle batteries are what power golf carts. However just one battery would not be enough, so they use battery packs instead. It's not expensive since you can just recharge after every use.
You equalize deep cycle batteries by charging with a higher than normal voltage for a short period of time. Consult the manufacturer for details.
infiltration
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No. Leave it plugged in. Each discharge and recharge of the battery is a cycle and will reduce the efficacy of the battery. The battery will still age and reduce but a good computer will keep it trickle charged when it is at full capacity preserving or extending its life a bit vs full discharge and recharge every day.
Most RV batteries are Deep Cycle type. Deep cycle batteries are lead-acid battery capable of being regularly discharged using most of its capacity in the process. Deep cycle batteries also have thicker plates inside the case. Normal car batteries will not discharge to the level or last as long as a deep cycle battery.As to how long it will last (lifespan) also depends on usage. Deep cycle batteries can be stored (fully charged) up to 12 months and only lose 25% of their capacity. Again depends on age of battery. Most RV's have a system where the deep cycle (RV) battery is constantly charged when the engine is running and most too will have a battery charge indicator on a control panel inside the RV itself.
Usually 12 volt deep cycle automotive batteries.
Deep cycle means that the battery gets almost totally drained before recharging occurs. You'd find this on batteries connected to solar panels for instance that are used at night. These batteries differ from a motorcar battery as draining a car battery completely, damages the battery. Deep cycle batteries are designed to deal with this and are usually more expensive than car batteries.