Gelled Electrolyte Lead Acid Battery (GEL)
The next types of batteries are gelled acid (Electrolyte) designs. They were introduced to American RVs and Marine enthusiasts by Sonnenschein of Germany over 30 years ago. Their introduction and widespread adoption was due to their increased efficiency and designed safety features. Their acid is immobilized by adding "fumed" silica to the sulfuric acid solution and then sealing the battery. They internally recombine most of the gases (hydrogen and oxygen) generated during charging and are maintenance free due to this.
Gelled electrolyte battery designs are generally quite old and few engineering options are left to improve them. Gel electrolyte is highly viscous and during charge and discharge the gel can develop voids (pockets) or cracks when the amperage is increased. These pockets impede acid flow and result in the loss of battery capacity. Also the gelled mixture can liquefy upon charge due to the shearing action of gassing (this property is called "thixotropic"). After termination of charge, it can take an hour for the acid to gel again. During this time liquid is moving and the battery can leak if any opening has developed. Last, gel batteries may store hydrogen gas that has not recombined. When overcharging causes a gel battery's vent caps to open, explosive gasses may be vented into the battery compartment. This vented hydrogen has caused a number of "fast failures" or battery explosions.
The next types of batteries are gelled acid (Electrolyte) designs. They were introduced to American RVs and Marine enthusiasts by Sonnenschein of Germany over 30 years ago. Their introduction and widespread adoption was due to their increased efficiency and designed safety features. Their acid is immobilized by adding "fumed" silica to the sulfuric acid solution and then sealing the battery. They internally recombine most of the gases (hydrogen and oxygen) generated during charging and are maintenance free due to this.
Gelled electrolyte battery designs are generally quite old and few engineering options are left to improve them. Gel electrolyte is highly viscous and during charge and discharge the gel can develop voids (pockets) or cracks when the amperage is increased. These pockets impede acid flow and result in the loss of battery capacity. Also the gelled mixture can liquefy upon charge due to the shearing action of gassing (this property is called "thixotropic"). After termination of charge, it can take an hour for the acid to gel again. During this time liquid is moving and the battery can leak if any opening has developed. Last, gel batteries may store hydrogen gas that has not recombined. When overcharging causes a gel battery's vent caps to open, explosive gasses may be vented into the battery compartment. This vented hydrogen has caused a number of "fast failures" or battery explosions. 
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