Where To Buy Deep Cycle Battery
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Before we dive into what is a deep cycle battery, it is first important to understand a few battery basics of what a cycle is, what depth of discharge means, and what it really means to deep discharge a battery.
In SLA (sealed lead acid) batteries, the electricity is generated in the plates. In high-rate batteries, there are many thin plates to allow for more surface area for quick generation of energy. In deep cycle batteries, the plates are thicker than those inside a high-rate battery because the energy-inducing chemical reaction goes into the plate and therefore needs to be thick to be able to handle the reaction. If the plates were thin, like they are in high-rate and starter batteries, the lead plates would degrade very quickly and would not hold up to multiple deep discharges over time.
Two subcategories of deep cycle SLA batteries would be deep cycle gel and AGM (absorbent glass mat) deep cycle. Gel batteries use a substance that turns the electrolyte acid inside the battery into a thick gel, therefore making it non-spillable. The gel is better at heat distribution and off-gassing than the AGM, and therefore has better performance throughout its life. In AGM batteries, a glass mat is placed between the negative and positive plates to keep the electrolyte in place. The mat is what makes the battery non-spillable and optimizes the surface area of the plates for better electrolyte distribution over conventional batteries.
In a lithium deep cycle battery, energy cells are used. Energy cells are designed to deliver sustained current over a long period of time, making them ideal for use in cyclic and deep cycle applications. In addition to the cell makeup inside a lithium battery, the circuitry also matters as the protections may set limits to how much current can be drawn from the battery. Different lithium batteries will have different levels of protection, so make sure to check the technical documentation and specifications for further information.
Before selecting a battery, you will need to have a clear idea of what needs to be powered, for how long, how often, and how much power it needs. In general, deep cycle batteries are cyclic applications where the user tells the battery when it needs to be used.
For example, a medical cart used in a hospital will be away from an electrical outlet and need battery power for the entire time it is unplugged. In this instance, the nurse or doctor tells the battery when it will be used by turning on the medical cart. It will be used every single day for many hours each day. The battery needs to provide consistent power for a long amount of time, meaning this is a deep discharge use and therefore needs a deep cycle battery.
There are many other applications that utilize deep cycle battery technology and these include marine, leisure (including RV batteries), mobility scooters, all types of electric vehicles and solar applications.
One of the main differences between a lead acid and a lithium deep cycle battery is the cyclic performance. With a lithium deep cycle battery the capacity is independent of the discharge rate, this means in deep cycling applications where the discharge rate is often greater than 0.1C (what is a c-rate?), a lower capacity rated lithium battery will often out perform the equivalent lead acid battery.
When it comes to measuring how long a deep cycle battery will last the correct way is in cycles rather than time. A lead acid battery can give 200 cycles (based on 100% DOD, to 80% capacity) whereas a deep cycle lithium battery can achieve over 10 times the amount at 2000 + cycles.
If you want to maximize the life and performance of your deep cycle battery it is essential to charge it the correct way. Charging your battery in the correct way with the right type of charger depends on the battery chemistry, voltage and capacity. Power Sonic has two guides for charging a deep cycle battery the first one is for charging a lead acid battery and the second is how t