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There are several battery car systems that can be considered popular because many people used them. These are the flooded cell batteries, sealed batteries, deep cycle batteries and lithium-ion batteries.
Series three of the six batteries into group one. Series the other three remaining batteries into group two. Parallel group one and twos positives together. Parallel group one and twos negatives together. The total voltage will equal 36 volts on the paralleled positive and negative cables. If you are thinking of using these on a golf cart then forget it. Automobile batteries are not deep cell batteries as a golf cart battery is. They are not designed to be totally discharged as a deep cell battery is. They will work but will not last very long. The repeated charge and discharge will destroy the batteries in a very short time.
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You equalize deep cycle batteries by charging with a higher than normal voltage for a short period of time. Consult the manufacturer for details.
2/12volts batteries
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.
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Connect three 12 volt batteries in series and you will have 36 volts but will only have the amperage of one of the batteries.
automobile batteries have more number of lead plates to facilitate quick and large amount of power output during engine starting. They give large amount of power for few seconds to start the engine, not continuously, Whereas the Inverter batteries give steady power output for long time.Deep Cycle Batteries:The inverter batteries are normally called deep cycle batteries. The battery plates in such type batteries won't get damaged even in deep discharge condition. But the automobile battery is quite different from deep cycle batteries, if an automobile battery is discharged deeply, then definitely it will damage the lead plates and reduce the battery life
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.