EnerSys PowerSafe ESG Batteries

EnerSys PowerSafe ESG batteries are engineered with proprietary material and design features that deliver robust performance and reliable service to meet the demanding needs of the power industry. This makes the ESG battery ideal for challenging load profiles and service conditions. The five 4 volt (187 - 418 Ah) multi-cell unit construction helps to minimize floor space.


Standard features like thick positive plates ensure excellent long discharge capability while the copper insert post design enhances high rate performance. Individual posts easily accommodate monitoring and test equipment used in routine maintenance and inspections.

EnerSys PowerSafe ESG series batteries employ a Slide-Lock™ post seal that allows for natural plate growth over time for maximum reliability and reduced maintenance. The innovative tongue-and groove jar-to-cover seal provides a robust airtight seal.
All models are offered with 100% capacity out of the box for reliable operating performance from day one.

EnerSys PowerSafe ESG Specifications:

  • Capacity from 187 to 935 Ah
  • 20 year life expectancy in float service at 77 degrees F
  • 100% initial capacity
  • Thick grids provide excellent long duration discharge performance and long life
  • Individual terminals to monitor individual cell performance
  • Electrolyte reserve reduces watering requirements
  • Slide-Lock™ post seal design

EnerSys PowerSafe ESG Battery Construction:

  • 0.28” thick positive plates provide excellent long discharge rates and long life

  • Separator – microporous phenolic resin with glass fiber retainers

  • Standard jar material Styrene Acrylonitrile (SAN) with flame retardant PVC cover. Optional PC flame retardant jar and cover are available

  • Electrolyte – dilute sulfuric acid with specific gravity of 1.215

  • Plated copper terminals with dual hole design

  • Flame arrestors – included for increased operational safety

  • Slide-Lock post seal design

EnerSys PowerSafe ESG Installation & Operation:

  • Tin plated copper inter-cell connectors standard; lead plated optional

  • Dual posts for high current carrying capability (ESG-19 and above)

  • Excellent one-minute rate, long duration discharge and complex duty cycle capability for switchgear applications

  • 20 year life expectancy in float service at 77°F (25°C)

  • Operating temperature: 32°F (0°C) to 104°F (40°C)

  • Recommended temperature: 68°F (20°C) to 86°F (30°C)

Downloads & Documentation

See below for documentation relating to this product line that is available to download. To download this documentation, please click on the desired document you’d like to download and fill out the required form information fields. You will be able to view and download the documents upon completion of the download form.

  • EnerSys PowerSafe ESG Range Summary
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