Low to Medium settings can normally be used without problems. The “High” or “Boost” settings are typically 15.2 to 17 volts. Most wheeled (shop) chargers offer a voltage regulation of 13.8 to 14.2 volts on the “Low” setting and 14.4 to 14.8 volts on the “Medium” setting. In addition, Dual Stage Performance AGMs can produce both high levels of CCA (Cold Cranking Amps) and vehicle starts due to the number of plates per cell, and hundreds of deep cycles at the same time.ĪGM batteries generally require a charge voltage regulation of 14.4 to 14.8 volts. Unless the AGM battery produces approximately 400 deep cycles to 80 percent depth of discharge (DoD) and/or 600 to 700 cycles at 50 percent DoD, it is not a true deep cycle. 3 to 4 times the amount of deep cycles than Single Stage AGMs due to the active material density levels. An improved power capability at extremely low temperatures than their flooded or Single Stage AGM batteries counterparts. Dual Stage performance AGMs have an even lower internal resistance than other AGMs due to their improved lead purity levels - approximately 99.9 percent pure. Higher recharge acceptance characteristics than flooded or Single Stage AGMs. ![]() These batteries, referred to as Dual Stage Performance AGMs, feature: Other AGM batteries have these same characteristics plus have other attributes. Some AGMs have the common characteristics mentioned previously. Similar to flooded batteries, there are differences between AGM batteries. With their unique internal assembly and physical design, an AGM battery’s vibration resistance is normally high (5 to 10 times that of flooded batteries. What’s more, AGM batteries are Valve Regulated Lead Acid (sealed) batteries that do not have an open vent system like flooded lead acid. ![]() Instead, AGMs have an oxygen-recombination chemistry wherein oxygen recombines between the negative and positive plates during discharge and recharge.Īn AGM battery has a much lower internal resistance than flooded lead-acid batteries therefore allowing a higher recharge acceptance. Will using or changing AGMs cure my fleet’s battery problems?ĪGM batteries are lead-acid batteries that hold or suspend the electrolyte in a highly absorption micro-glass mat that acts as the separator material between the positive and negative plates.ĪGM batteries do not emit hydrogen and oxygen externally like flooded lead-acid batteries. Can I expect twice the life from an AGM? Will my regular wheel (shop) chargers work on AGMs? How do AGM truck batteries differ from conventional batteries? The primary questions I receive from fleet managers about AGM batteries are: ![]() There has been much confusion and concern regarding what some people consider “new battery technology.” More specifically, the misunderstanding is about AGM (Absorbed Glass Mat) batteries that have arrived on the truck fleet scene within the last 1 to 2 years.ĪGM battery technology, which offers improvements over other sealed battery technologies, including additional life and performance, has been around for decades.
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