They are actually absorbed gas mat batteries(agm batteries). Advantages: Vibration and you can mount them sideways...that is all. They actually have less power than a conventional wet lead acid battery. The only advantage in the industrial deep cycle market is that no one can forget to put water in a $1000 set of batteries. True gel cell batteries require a special battery charger. They don't sell this kind of battery or charger at the auto parts store or make them for bikes or cars.. Now, Lithium batteries that are the size of a pop can replacing your trucks full size battery....That's an advantage. But they cost too much now. http://www.youtube.com/watch?v=hs37xn-QpKY&feature=player_embedded