Due to the fact that AGM batteries were first created for military purposes, they are far more durable and able to withstand much more hard use than wet-cell or conventional deep-cycle gel batteries. As the glass mats retain the electrolyte, there is nothing to leak or spill and they are comparatively unaffected by freezing damage.
AGMs require little to no maintenance, just like conventional sealed batteries. The fact that the majority of them are “recombinant” is an additional benefit. This translates to relatively minimal water loss and hydrogen emission because during charging cycles, oxygen and hydrogen combine inside the battery to generate water. So, compared to other batteries, these ones are less dangerous.
Because AGM batteries don’t leak or emit fumes, they can be stored in locations that are otherwise forbidden. They may be stored safely on their sides or on their ends if necessary, which is another benefit of this quality.
The battery’s design brings the electrolyte and active plate material closer together. As a result, both the discharge and charge cycles operate more effectively. Due to this plus the battery’s extremely low internal resistance, AGM batteries typically charge more quickly and to a higher capacity than non-AGM batteries. Also, they can withstand high discharge rates without being damaged and the odd discharge that falls below the advised 50% of capacity guideline.
Even if completely depleted in storage, AGMs have a very low discharge rate and, provided they are not left in a discharged state for too long, can be swiftly recharged back to over 95% of their capacity. The benefit is that there won’t be a flat battery after long-term storage (within reason of course).
A excellent service life of up to 5 years can be reached when working normally. Managed discharge and charge even longer lifespan are typical with good handling and maintenance. Some sources mention ten years or more.
AGM batteries are significantly more expensive than common wet-cell and deep cycle batteries. However when you compare this price to their durability, longer expected life, and improved performance, they continue to offer the best overall value.
A wet-cell battery can only be charged to about 70–80% of its capacity with a “regular” automobile alternator. AGM batteries charge more quickly and almost completely from the same kind of alternator due to their greater charging rates.
The charging rate of AGM batteries can reach 75% of their rated ampere-hour capacity. In some circumstances, this might result in alternators or conventional auto chargers being damaged because of the extreme heat produced when trying to give maximum amps. The upside is that AGMs will charge lower rates and be content with doing so. However, you should seriously consider purchasing a high-quality three-stage charger if you are going to spend money on a great battery.
AGM batteries are versatile. They can be used as starter batteries for deep cycle applications or as standby batteries for critical power systems. For these reasons, it is ideal for camping applications. They can also be connected in series or parallel to provide different terminal voltages and amperage capacities. I’m using two AGMs connected in parallel in a pop-up camper. They charge via a 3 stage “smart” charger and I’ve never had a problem with them