OPzS – Flooded Lead Selenium Tubular Plate Battery

Overview - OPzS Battery

The Mesa OPzS battery is a tubular plate deep cycle battery. The OPzS range consists of OPzS cell and multi-cell blocks conforming to DIN 40737-3 and 40744. They are ideal for use in all DC power supply installations. The batteries have a long watering interval, and typically need topping-up only once a year throughout their operating life. The combination of lead-selenium alloy with tubular plate construction makes the Mesa OPzS Battery the longest service life alloy battery in the world.


  • Utility Switchgear
  • Telecommunications
  • UPS Units
  • Power Plants
  • Substations
  • Emergency Backup Power
  • Specifications

  • Tubular plate with lead selenium alloy
  • Float charge: 2.23 – 2.25 VPC
  • Equalize charge: 2.33 – 2.40 VPC
  • Specific gravity: 1.240 kg/L @ 77°F
  • Styrene Acrylonitrile jar & cover
  • Flame retardant UL V0 94 jar & cover available
  • OPzS Battery – Flooded Lead Selenium Tubular Plate Cells

    OPzS Battery – Flooded Lead Selenium Tubular Plate Blocks

    Tubular Plate Design

  • Proven 20-year service life
  • Excellent cycling characteristics: up to 1,500 cycles to 80% DOD
  • Meets or exceeds DIN 40737-3 and 40744
  • Stable float charge characteristics
  • Compatible with existing installations
  • Robust Design

  • Lead selenium alloy is corrosion resistant and reduces plate growth
  • Leak proof, tongue-in-groove jar-cover seals
  • Minimizes seal failures and container & cover cracks
  • Extremely long intervals between watering
  • Excellent post seal design
  • Reduced maintenance & reduced footprint
  • Clear SAN Jars

  • Impact-resistant, clear Styrene Acrylonitrile (SAN) jars
  • Provides crystal clear viewing of the cell plates, bridges, and electrolyte
  • Easy inspection of cell condition and electrolyte level
  • Optimized Connector System

  • Fully insulated connector with test points for ohmic and voltage measurements
  • Reduces terminal connection maintenance
  • External welded connections between individual cells allow for testing individual cell voltages, internal resistance or conductance, and monitoring individual cells during load testing