A Deep Dive into AGM Deep Cycle Batteries

AGM Deep Cycle Batteries

Let’s take a deep dive into AGM Deep Cycle Batteries. When picking batteries for 6V & 12V systems and appliances, the choice usually comes down to AGM deep-cycle batteries.  AGM batteries are the go-to option for motorhomes, boats, and devices that need to run over long periods, such as portable fridges, light kits, inverters, etc.

What is an AGM Deep Cycle Battery?

AGM is an abbreviation for “Absorbed Glass Mat”.  In other words, AGM deep cycle batteries are built differently from the standard wet, gel or flooded battery.  The presence of a chemical component, usually sulfuric acid, sets them apart, which triggers a reaction that results in voltage and electricity.  The chemical absorbs into a fine fibreglass mat, making the battery spill-proof and safe to ship without hazardous material restrictions.

We’ve tackled the meaning behind AGM, but what does deep cycle mean?  The term deep cycle refers to the ability of the battery to be discharged and recharged for multiple cycles.  As opposed to starter batteries, like car batteries, which offer a short burst of energy and discharge only a small part of their capacity, a deep cycle battery delivers a steady flow of current over a more extended period.

Key Benefits of AGM Deep Cycle Batteries:

  1. Durable: One of the most significant benefits of AGM batteries is that they have a longer lifespan than other batteries.  For instance, compared to a flooded battery, an AGM deep cycle battery can last up to two or three times as long.  The main reason AGM batteries are so long-lasting is that they are deep-discharge resistant.  In other words, they can hold a charge longer and remain charged for 6 to 8 months without being used because they have a low self-discharge rate.

2. Safe: Because the glass mat absorbs lead acid, this battery is unspillable.  As such, these batteries present no risk of electrolyte burns.  In addition, AGM batteries do not give off any gas during charging, so you don’t need to worry about adequate ventilation.  They can also work appropriately during cold temperatures, which is not the case with regular lead-acid batteries.

3. Easy To Maintain: A very convenient advantage of AGM batteries is that you can use them immediately.  Besides recharging them before use, these batteries do not need additional care, such as topping off liquids like their flooded cell counterparts.  As a result, AGM batteries save users time on installation and maintenance.

4. Versatile: The AGM batteries come in a wide range of capacities and, therefore, have many uses, including renewable energy such as solar power and wind energy, motorhomes,  boats, industrial applications and much more

As a result, they are perfect in all kinds of outdoor conditions, such as motorhomes and boats.  Plus, at the end of your AGM deep cycle battery life, you can dispose of it easily as there’s no risk for dangerous chemicals to spill into the environment.  

AGM Deep Cycle Batteries Limitations

AGM batteries are also sensitive to overcharging, as are all gelled and sealed batteries.  While a charge of around 2.40V/cell is safe in most cases, keeping the charge between 2.25 and 2.30V/cell is recommended, especially during the summer.

You can not use your regular battery charger on AGM.  Also, do not rely on an alternator to do the work of a charger.  We recommended installing a Battery Monitor and a Trident Mains Charger.

Buying a battery is a significant investment; we recommend seeking expert advice to ensure you purchase the correct size battery and understand how to maintain them. To talk to an AGM Deep Cycle Expert Contact Us.