AGM Batteries

Introduction AGM Batteries

In AGM batteries, there is a thin ultra-fine fiberglass mat sandwiched between the plates that is saturated with battery acid to about 95% of what they can hold. This mat is then packed in between the plates and slightly compressed, then welded/soldered in place. Because the plates and mats are packed fairly tight, they are almost immune to vibration.

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 batteries have very low internal resistance, is capable to deliver high currents on demand and offers a relatively long service life, even when deep cycled.

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, but cheaper than theĀ gel battery.

Maintenance and Handling of AGM Batteries

AGM batteries are 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. AGM and other sealed batteries do not like heat and should be installed away from the engine compartment.

AGM Batteries Warranty

Tensite brand offers a 2-year warranty is offered from the moment of purchase for AGM 12V monoblock batteries. This guarantee would be valid during those two years provided that the use, handling and compatibility of the battery by the customer has been adequate and the failure comes from an error in its manufacture. The company will take the necessary steps to ensure that the battery failure comes from a manufacturing error.

Model Capacity (Ah) C10 Capacity (Ah) C100 Datasheet
AGM DC 9 9 (C20)
AGM DC 12 12 (C20)
AGM DC 18 18 (C20)
AGM DC 35 35 (C20)
AGM DC 70 70 (C20)
AGM DC 90 80 90
AGM DC 100 90 100
AGM DC 150 120 150
AGM DC 250 200 250
AGM FT 250 200 250
AGM DC 300 250 300
Model Lenght (mm) Width (mm) Total Height (mm) Weight (kg)
AGM DC 9 151 65 100 2.55
AGM DC 12 152 99 100 3.5
AGM DC 18 181 77 167 5.3
AGM DC 35 195 130 168 10.15
AGM DC 70 347 168 176 19.1
AGM DC 90 329 172 225 25.8
AGM DC 100 329 172 225 26.0
AGM DC 150 407 174 233 35.5
AGM DC 250 522 240 226 57.0
AGM FT 250 547 124 320 55.5
AGM DC 300 520 268 225 66.0