"OPZV" stands for "Ortsfest (stationary), Panzerplatten (tubular plate), Gel (gel electrolyte), Verschlossen (sealed)." It is a type of valve-regulated lead-acid (VRLA) battery that uses immobilized gel electrolyte instead of liquid acid electrolyte. OPZV batteries are commonly used in applications where long service life, high energy density, and maintenance-free operation are required.