The Biggest Difference Between AGM and Other Types of Lead Acid Batteries

The Biggest Difference Between AGM and Other Types of Lead Acid Batteries

AGM innovation came to be popular within the very early 1980s as a covered lead acid battery for army airplanes, lorries further as UPS to reduce weight and also enhance dependability. The acid is soaked up by a awfully fine fiberglass mat, making the battery spill-proof. This makes it possible for delivery without dangerous product restrictions. Home plates may be made flat to appear sort of a conventional flooded lead acid pack in an exceedingly rectangle-shaped instance; they will even be wound into a round cell.

AGM has really low interior resistance, is qualified to produce high currents as required and supplies a fairly lengthy service life, even when deep cycled. AGM is maintenance free, offers good electrical reliability also as is lighter than the flooded lead acid kind. While routine lead acid batteries need a covering charge every 6 months to prevent the build-up of sulfation, AGM batteries are much less prone to sulfation and might sit in storage for extended before a charge involves be required. The battery stands well to reduced temperatures and also encompasses a low self-discharge.

The leading advantages of AGM are a charge that depends on 5 times faster than the flooded version, and therefore the capacity to deep cycle. AGM supplies a depth-of-discharge of 80 percent; the flooded, on the opposite hand, is defined at 50 percent DoD to realize the identical cycle life. The negatives are slightly reduced details energy also as greater manufacturing prices than the swamped, yet less expensive than the gel battery. Table 1 contrasts AGM batteries to gel batteries on crucial performance qualities.


Table 1: Comparisons on AGM and gel batteries

Resource: Institute for Power Electronics and Electrical Drives (ISEA), Aachen College; evaluation based upon experience of. Dr. Grzegorz Pilatowicz

The majority of AGM batteries are mid-sized moreover as variety from 30 to 100Ah. they will additionally be located in UPS, huge further as little for stationary and also deep cycle usage. they're typically constructed to dimension and are located in premium vehicles to run power-hungry devices like heated seats, steering wheels, mirrors and also windscreens. NASCAR and also various other racing leagues choose AGM items thanks to the actual fact that they're vibration resistant.

AGM is that the preferred battery for prime end motorbikes. Being secured, AGM reduces acid spilling during a crash, reduces the load for the precise same performance and allows setup at odd angles. thanks to excellent performance at cold temperatures, AGM batteries are likewise used for marine, housing and also robotic applications.

AGM is making invasions into the start-stop function of autos. The timeless swamped kind is simply not robust adequate and also repeated cycling triggers a pointy capacity discolor after only two years of use. (See BU-806a: Heat, Loading and Battery Life.).

Similar to all gelled still as secured units, AGM batteries are sensitive to overcharging. A charge to 2.40 V/cell (and higher) is great; however, the float cost should be minimized to in between 2.25 and also 2.30 V/cell (summer temperatures might need lower voltages). Automotive charging systems for swamped lead acid usually have actually a taken care of float voltage setup of 14.40 V (2.40 V/cell); an instantaneous replacement with a sealed unit might overcharge the battery on a protracted drive. (See BU-403: Billing Lead Acid.).

AGM and also other covered batteries don't like warm furthermore as should be installed faraway from the engine area. Manufacturers recommend stopping cost if the battery core gets to 49 ° C( 120 ° F). Table 2 spells out the advantages and also limitations of AGM.


Spill-proof with acid encapsulation in matting innovation.

High particular power, low interior resistance, conscious of load.

Up to five times faster fee than with flooded modern technology.

Much better cycle life than with swamped systems.

Water retention (oxygen additionally as hydrogen integrate to supply water).

Vibration resistance thanks to sandwich construction.

Stands well to cold temperature level.

Less vulnerable to sulfation if not frequently covering billed.

Has less electrolyte and also lead than the swamped version.


Higher cost than flooded.

Sensitive to overcharging (AGM has tighter tolerances than gel).

Ability has steady decrease (gel has an efficiency dome).

Low certain power.

Should be stored in charged problem (much less vital than flooded).

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