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OPzS – Flooded Lead Selenium Tubular Plate Battery

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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.

Applications: Utility switchgear, Telecommunications, UPS units, Power plants, Substation, Emergency backup power


  • 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

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
Click here to learn more about our safety guidelines, regulations, resources and more.

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