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This can vary considerably, depending mainly on the age and quality of the battery. Internal resistance losses in standard flooded Lead-Acid batteries is usually around 10% to 15% for a new battery, and can be as high as 25%+ for older batteries. Losses from internal resistance shows up as heat, which is why batteries tend to get warm when heavily charged or discharged for a while. Internal resistance of a battery denotes its overall charge/discharge efficiency, its ability to deliver high currents without significant drops in voltage, and is a measure of the quality of the components and construction.

This comparison is important and is critical for high charge or discharge rate applications. We can special order almost any Concorde battery. We don't stock the Concorde "Chairman" (designed mainly for wheelchairs) batteries or the "LifeLine" (marine & RV) batteries, but our supplier has them in stock. We feel that bolt on terminals give a much more reliable connection. The major difference is that the Sun-Extender batteries have bolt-on terminals instead of the common post type. The Concorde SunXtender batteries are essentially the same construction as the Concorde Lifeline, Chairman, and other Concorde AGM batteries. It is primarily plate thickness that makes a battery deep cycle, not whether it is flooded, gelled, or AGM. Those still have the advantages of AGM, but are not deep cycle. Several companies, such as Optima, have adopted AGM for starting batteries and other non-deep cycle applications. AGM - Deep Cycle Or Not?Īn important thing about AGM - Just because a battery is AGM does NOT make it a deep cycle battery.

Several manufacturers now produce AGM batteries, but Concorde was the first to develop the technology for commercial non-military use. The Concorde AGM batteries are VRSLAB (Valve Regulated Sealed Lead-Acid Battery), sometimes referred to as VRLA (Valve Regulated Lead-Acid). Because the plates and mats are packed fairly tight, they are almost immune to vibration.ĪGM (Absorbed Glass Mat) sealed battery technology was originally invented in 1980, and developed and introduced in 1985 for military aircraft where power, weight, safety, and reliability were paramount considerations. This mat is then packed in between the plates and slightly compressed, then welded/soldered in place. In AGM batteries (also called starved electrolyte), there is a thin ultra-fine fiberglass mat sandwiched between the plates that are saturated with battery acid to about 95% of what they can hold. This write-up covers mainly the Concorde Sun-Xtender AGM's, but also applies to most other brands of deep cycle AGM batteries.