How did Exide eliminate liquid battery acid?
In a conventional battery, the lead elements are totally submerged in the electrolyte (acid). Although many batteries today are maintenance-free and do not require checking and refilling of the acid, they must be mounted upright in order to allow the gas to be vented through a series of holes. Improper mounting (or handling of a conventional battery) could result in acid leaking from these vent holes. In the event of severe overcharge, this new battery still needs to vent gas, but its valve-regulated-lead-acid construction features six “burp” valves which allow the gas to escape without compromising its sealed quality. And there is no free-liquid electrolyte to escape through these burp valves. The Exide Select orbital uses AGM (absorbed-glass matte) separators, which, along with the tightly-wound lead elements, have the acid (in a paste-like form) bound within their structure, eliminating the need for free electrolyte. The separators work similar to the principle by which paper towels
