Neither technicians A and B are correct. All kinds of optima cells need a sealed lead-acid battery. Meanwhile, an absorbed glass mat (AGM) battery is considered an SLA battery.
All kind of optime batteries are SLA AGM batteries, very resistant to vibrations and ready to operate in any position. Each of Optima's six cells uses AGM plates to keep the acid in place. These are wound into precisely compressed spiral cells and inserted into the case. Sealed Lead Acid (SLA) and Valve Regulated Lead Acid (VRLA) are two different abbreviations for the similar cell. Absorbed Glass Mat (AGM) refers to a shape of SLA/VRLA in which the electrolytes are soaked into dividers throughout plates made out of sponge-like thin glass fibretion matting.
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