Deep Cycle Batteries.

Deep-cycle batteries are a type of battery that is designed to be repeatedly discharged and recharged. They are commonly used in applications such as golf carts, RVs, and solar power systems. Regular maintenance is essential to maximize a deep-cycle battery's life. This includes inspecting the battery's fluid level and voltage after the charging service. You can use a hydrometer and DC voltage meter to perform these inspections.

Deep-cycle batteries may look like car batteries to unfamiliar people, but they're pretty different. A deep cycle battery is a lead battery designed to provide sustained power over a long period and run reliably until it is 80% discharged or more; at this point, it needs to be recharged. It is important to note that although deep cycle batteries can be removed up to 80%, most manufacturers recommend not discharging below 45% to extend the battery's life.

The discharge level is the “deep cycle” and stands in contrast to other types of batteries that provide only short bursts of energy before recharging. Precisely, a starter battery discharges only a tiny percentage — usually 2 to 5% —each time it is used.

TYPES OF DEEP-CYCLE BATTERIES

• Flooded deep-cycle batteries: These are the most common type. They are relatively inexpensive and easy to find. However, they require regular maintenance, such as adding distilled water to the electrolyte.

• Sealed deep-cycle batteries: These batteries are also known as maintenance-free batteries. They do not require the addition of distilled water, making them easier to maintain. However, they are more expensive than flooded deep-cycle batteries.

• Absorbed Glass Mat (AGM) batteries: AGM batteries have a glass mat that absorbs the electrolyte. This makes the electrolyte more evenly distributed throughout the battery, which helps to improve performance and lifespan.

• Gel batteries: Gel batteries add a gelling agent to the electrolyte. This makes the electrolyte thicker and more viscous, which helps to prevent the battery from leaking.

• Lithium-ion batteries: Lithium-ion batteries are a newer type of deep-cycle battery that offers several advantages over traditional lead-acid batteries. They are lighter, have a longer lifespan, and can be discharged more deeply without damage. However, they are also more expensive than lead-acid batteries.

THE COMPONENTS OF DEEP-CYCLE BATTERIES

Both flooded and sealed deep-cycle batteries share some of the same components, including:

• Lead plates: The lead plates are the active part of the battery. They react with the electrolyte to produce electricity.

• Electrolyte: The electrolyte is a mixture of sulfuric acid and water. It conducts electricity and helps to carry the chemical reaction between the lead plates.

• Case: The case protects the battery from damage and holds the other components in place.

APPLICATION

Perhaps the most crucial consideration when choosing a deep-cycle battery is what you intend to use it for. Here are some situations that make a difference in the type of deep-cycle battery you choose:

Stationary or Level Equipment

If you’re looking for a deep cycle battery for a vehicle that remains level or a stationary application, a flooded deep cycle battery may be your best bet. Flooded batteries are the most common type of deep-cycle battery, and as such, they are generally easier to find and more cost-effective than other types of batteries. Because they use a liquid electrolyte, they can only be used uprightly. They should also be used in applications that allow easy charging, watering, and other maintenance access.

Examples: forklifts, renewable energy storage

Variable Conditions

In applications where temperature and required power draw vary, a VRLA battery, such as an AGM battery, may be the best option. Because VRLA batteries are sealed, there is less chance of damage or weathering of the inside components, which helps to ensure a longer lifespan and better performance. VRLA batteries can operate in any orientation, not just upright like flooded batteries, so they’re ideal for situations where they might frequently tip or are installed sideways.

Examples: boats, RVs

Maintenance Capabilities

In addition, VRLA batteries may be better suited when regular maintenance is complex. All deep-cycle batteries need to be charged according to manufacturer specifications, so some care is always required, but if you’re unable to water your battery frequently for whatever reason, you should consider buying a VRLA.