Deep Cycle VRLA Batteries - GEL Series

CSP GEL Deep Cycle Battery is a VRLA battery with a Gelified electrolyte; the sulfuric acid is mixed with silica fume, which makes the resulting mass GEL-like and immobile.
GEL batteries virtually eliminate the electrolyte evaporation, spillage (and subsequent corrosion Issues) common to the wet-cell battery, and more features like greater resistance to extreme temperatures, shock, and vibration.The valve regulation system allows for gas to be expelled. They are the same as wet (non-sealed) batteries except that the antimony in the lead plates is replaced by calcium.
This preserves the mechanical characteristics but renders the construction far less prone to gassing.