Lead-acid batteries Parus electro of the HMF series with frontal terminal arrangement are convenient for installation and maintenance in a 19-inch telecommunications rack. Models of the HMF series have an increased specific capacity characterizing amount of energy per unit volume of the element, which allows placing more batteries per unit area. Using of thickened plates with high-quality lead-tin-calcium alloy gratings ensures long battery life. Durable copper terminals provide great conductivity at high discharge currents and modern technology of sealing the monoblock cover allow creating a reliable connection of the case along the entire length. HMF series battery life is up to 12 years.