What is AGM and how is that different from Maintenance Free?
Flash Dear Sir: Thank you for your email. Wet Cell (flooded), Gel Cell, and Absorbed Glass Mat (AGM) are various versions of the lead acid battery. The wet cell comes in 2 styles; serviceable, and maintenance free. Both are filled with electrolyte and I prefer one that I can add water to and check the specific gravity of the electrolyte with a hydrometer. The Gel-Cell and the AGM batteries are specialty batteries that typically cost twice as much as a premium wet cell. However they store very well and do not tend to sulfate as easily as wet cell. There is no chance of a hydrogen gas explosion or corrosion using these batteries. Most Gel-Cell and some AGM batteries require a special charging rate, especially the deep cycle models. I personally feel that careful consideration should be given to the AGM battery technology for applications such as Marine, RV, Classic and Performance cars just to name a few. If you don’t use or operate your equipment daily; which can lead premature battery
