AGM Battery

AGM is the lead acid battery for military aircraft, vehicles, and UPS to decrease weight and progress reliability. The sulfuric acid is absorbed by an exact fine fiberglass mat, building the battery spill-proof. This allows shipment without risky material restrictions. AGM has very low internal resistance, is capable of delivering high currents on demand and offers a comparatively long service life, even when deep cycled. AGM is maintenance free, provides good electrical dependability.

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Detailed Description for AGM Battery

 

Absorbent Glass Mat (AGM)

AGM technology became popular in the early 1980s as a sealed lead acid battery for military aircraft, vehicles and UPS to reduce weight and improve reliability. The sulfuric acid is absorbed by a very fine fiberglass mat, making the battery spill-proof. This enables shipment without hazardous material restrictions. The plates can be made flat to resemble a standard flooded lead acid pack in a rectangular case; they can also be wound into a cylindrical cell.

AGM has very low internal resistance, is capable to deliver high currents on demand and offers a relatively long service life, even when deep cycled. AGM is maintenance free, provides good electrical reliability and is lighter than the flooded lead acid type. While regular lead acid batteries need a topping charge every six months to prevent the buildup of sulfation, AGM batteries are less prone to sulfation and can sit in storage for longer before a charge becomes necessary. The battery stands up well to low temperatures and has a low self-discharge.

The leading advantages of AGM are a charge that is up to five times faster than the flooded version, and the ability to deep cycle. AGM offers a depth-of-discharge of 80 percent; the flooded, on the other hand, is specified at 50 percent DoD to attain the same cycle life. The negatives are slightly lower specific energy and higher manufacturing costs than the flooded. 

Most AGM batteries are mid-sized and range from 30 to 100Ah. They are commonly built to size and are found in high-end vehicles to run power-hungry accessories such as heated seats, steering wheels, mirrors and windshields. NASCAR and other auto racing leagues choose AGM products because they are vibration resistant.

AGM is the preferred battery for upscale motorcycles. Being sealed, AGM reduces acid spilling in an accident, lowers the weight for the same performance and allows installation at odd angles. Because of good performance at cold temperatures, AGM batteries are also used for marine, motor home and robotic applications.

AGM is making inroads into the start-stop function of cars. The classic flooded type is simply not robust enough and repeated cycling causes a sharp capacity fade after only two years of use. 

As with all gelled and sealed units, AGM batteries are sensitive to overcharging. A charge to 2.40V/cell (and higher) is fine; however, the float charge should be reduced to between 2.25 and 2.30V/cell (summer temperatures may require lower voltages). Automotive charging systems for flooded lead acid often have a fixed float voltage setting of 14.40V (2.40V/cell); a direct replacement with a sealed unit could overcharge the battery on a long drive. 
AGM and other sealed batteries do not like heat and should be installed away from the engine compartment. Manufacturers recommend halting charge if the battery core reaches 49
°C (120°F). Table 1 spells out the advantages and limitations of AGM.

Advantages

Spill-proof through acid encapsulation in matting technology

High specific power, low internal resistance, responsive to load

Up to 5 times faster charge than with flooded technology

Better cycle life than with flooded systems

Water retention (oxygen and hydrogen combine to produce water)

Vibration resistance due to sandwich construction

Stands up well to cold temperature

Less prone to sulfation if not regularly topping charged

Limitations

Higher manufacturing cost than flooded (but cheaper than gel)

Sensitive to overcharging (gel has tighter tolerances than AGM)

Capacity has gradual decline (gel has a performance dome)

Low specific energy

Must be stored in charged condition (less critical than flooded)

Not environmentally friendly (has less electrolyte, lead that flooded)

Table 1: Advantages and limitations of AGM

 

Features and Benefits:

 

Using oxygen recombination technology: totally maintenance-free

Pb-Ca-Sn alloy for plate grids providing for low gassing and low self-discharge

Superior quality AGM separator for extended cycle life

Deep cycle capabilities

Flame-retardant PP materials used for containers and lids for 2V systems

Flame retardant Acrylonitrile Butadiene Styrene (ABS) boxes and lids for 12V systems

Low self discharge rate and

High quality inter-cell copper connectors for improved electrical conductivity.

 

Application-2V Series:

 

Tell-communication application (fixed or cellular)

Solar photovoltaic application

Network communication, data transmission, signaling, etc.

Uninterruptable Power System (UPS).

 

Design life (on float voltage @ 200C):

 

2 Volts: 20 years plus

 

 


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