In an AGM (Absorbed Glass Mat) battery, the electrolyte is absorbed into thin fiberglass mats that are placed next to the plates, rather than freely flooding the plates as in traditional flooded lead-acid batteries. This design provides several advantages over conventional battery types.
- Spill-proof: Since the acid is contained in the fiberglass mats, AGM dual purpose batteries are spill-proof, even if the battery is damaged. This makes them safe to transport and exempt from hazardous materials regulations.
- Vibration-resistant: Designed to endure the constant vibrations of military aircraft and helicopters, AGM batteries are highly resistant to vibration.
- Shock-resistant: AGM batteries are built to withstand shocks, making them ideal for rugged environments.
- Cold-temperature tolerance: AGM batteries perform better than standard wet-cell batteries in cold conditions. While they won't operate when frozen, they won't be damaged either.
- Versatile installation: AGM batteries can be installed in any orientation, offering greater flexibility in installation.
- Minimal gassing: These batteries produce minimal gas, allowing them to be used in areas with limited ventilation.
- Low self-discharge rate: AGM batteries can be stored longer without needing a recharge, thanks to their low self-discharge rate.
- Long lifespan: With proper maintenance, AGM batteries typically outlast traditional SLA (Sealed Lead Acid) batteries.
- No maintenance required: AGM batteries are maintenance-free, making them convenient and easy to use.
AGM batteries are commonly used in marine vehicles, RVs, golf carts, wheelchairs, scooters, UPS systems, and high-end motorcycles, where durability, reliability, and flexible installation are essential.
- Manufacturing costs are higher, making the batteries more expensive.
- They are sensitive to overcharging and high voltages, and require full charging between uses, which can make them un-suitable for some applications where returning them to a full charge is difficult.
- They require a charger specifically for AGM batteries that monitors volts, amps and ambient temperatures.
- Some older battery testers can't accurately test AGM batteries.
AGM batteries are well designed, reliable, and durable power sources for applications where their advantages outweigh their disadvantages.
Lead-acid batteries contain an electrolyte that emits gases, requiring the battery to be placed in a well-ventilated area to allow for proper ventilation and gas release. This means they need regular maintenance. In contrast, AGM batteries are maintenance-free and do not emit gases, making them ideal for use in enclosed spaces, such as vehicle trunks or beneath seats.
Lead-acid batteries are vulnerable to vibrations and harsh movements, which can cause them to break over time if exposed to such conditions. They need careful installation to reduce these risks. In contrast, AGM batteries, with their glass mats and sturdy battery plates, are much more durable and resistant to shock and vibration, making them suitable for harsh environments.
The internal resistance of a battery influences its voltage output—the lower the resistance, the higher the output. AGM batteries have a low internal resistance of about 2%, allowing for higher power output. In comparison, flooded lead-acid batteries typically have a higher internal resistance, ranging from 10-15%, resulting in lower output voltage. This makes AGM batteries more powerful than traditional lead-acid batteries.
Due to their low internal resistance, AGM batteries charge at a faster rate compared to flooded lead-acid batteries. AGM batteries can charge up to five times faster, making them more efficient in meeting high power demands and reducing charging time compared to conventional lead-acid batteries.
The AGM has a lower self-discharge rate that lasts longer than the flooded lead-acid batteries. The AGM has a lifespan of up to seven years if well maintained, compared to other batteries that last for three to five years. Therefore, the AGMs last longer and will serve you better than any other batteries.
