Flooded vs. Sealed Deep Cycle Battery: What's the Difference?
Do you own a boat, golf cart, motorcycle, or recreational vehicle? If so, you've likely bought some batteries, had them installed, and never looked at them again. This is a common mistake because some batteries require more than just scraping corrosion off the terminals.
Most people who own a deep cycle battery buy either flooded batteries or sealed deep cycle batteries. But what's the difference between the two? Let's dive in and find out.
What Is a Deep Cycle Battery?
A deep cycle battery is a lead-acid battery designed to provide power for applications like boats, solar energy systems, and RVs. Unlike starter batteries, which provide short bursts of energy to start an engine, deep cycle batteries deliver continuous power over long periods. They can reliably run even when discharged between 60% and 80%, though it's recommended not to discharge them more than 50% to extend their lifespan.
What Is a Flooded Battery?
Flooded deep cycle batteries have thick plates, large separators, and high-density paste material, making them resistant to corrosion from multiple charge and discharge cycles. These batteries use electrolyte fluid that completely submerges the plates, allowing for efficient charging and steady discharge.
Does a Flooded Deep Cycle Battery Require Maintenance?
Flooded batteries require regular maintenance. Check for corrosion at the terminals and ensure the electrolyte level is adequate. If the water level is low, refill with distilled water after charging is complete.
Advantages of a Flooded Deep cycle Battery:
Inexpensive
Easy to troubleshoot
Longer lifespan than sealed batteries
What Is a Sealed Deep Cycle Battery?
Sealed deep cycle batteries, also known as VRLA (Valve Regulated Lead Acid) batteries, are maintenance-free because the electrolyte fluid is sealed inside. They don't need to be upright and can be placed in various orientations, making them ideal for boats or recreational vehicles that experience a lot of movement.
Advantages of a Sealed Deep Cycle Battery:
Lighter
Faster charging
No regular maintenance required
Can be positioned in any orientation
Better for extreme temperatures
Types of Sealed Deep Cycle Batteries:
AGM (Absorbed Glass Mat): Uses woven glass fiber separators to suspend the electrolyte close to the active plates, providing excellent charge and discharge efficiency.
GEL Batteries: Similar to AGM but best used in high deep cycle applications like off-grid living and solar energy systems.
Which Deep Cycle Battery Is Right for You?
Choosing the right battery depends on your specific needs. Consider the following:
Choose a flooded deep cycle battery if:
Extreme temperatures are not an issue
You have time for regular maintenance
You're looking for a cost-effective option
You have a well-ventilated storage area
You want longer-lasting performance
You prefer to troubleshoot your battery manually
Choose a sealed deep cycle battery if:
You prefer maintenance-free operation
You need a battery that can be positioned in different orientations
Budget is not an issue
You're using the battery in extreme temperatures
You want a fast-charging battery
At RB Battery, we have the expertise to answer all your battery-related questions. If you need help deciding which battery is right for your application, feel free to contact us, and we'll be happy to assist you.